Travel phpроботи

Для нашого онлайн магазину шукаємо PHP розробника фрілансера Маємо два цікаві проекти. Завдання: Шукамо фрілансера для розвитку наших веб-магазинів електронної комерції за допомогою найсучасніших веб-технологій для різних пристроїв (мобільних, планшетів) Профіль: • Хороші знання з програмного забезпечення (об'єктно-орієнтований дизайн, шаблони проектування, тестування) • самостійна робота та вирішення проблем • високий рівень мотивації • Досвід роботи з PHP, Symfony, Laravel або Zend, є перевагою • Вільне володіння німецькою чи англійською мовами • Дуже хороші знання PHP, MySQL та JavaScript • Добре знання HTML (5) та CSS (3)

Потрібно поступово (по частинах) переписати застарівший самописний PHP інтернет-магазин з асортиментом декілька тисяч товарів на фреймворк Django, розширюючи його теперішній функціонал. Обов'язково: - попередній досвід веб-розробки на Django; - досвід створення RESTful API; - розуміння PHP. Бажано: - досвід на подібних проектах в ролі Senior; - досвід роботи з Flask; - досвід роботи з Vue.js; - досвід роботи з PostgreSQL.

needs to be finalized - add btc, payeer, perfect money, yandex money, visa / mastercard, pay pal payment methods. And also to add the calculator of interest calculation concerning the purchased investment packages by the client (so that the client can see the purchased package and accruing on it depending on the elapsed time and for the current period after payment in his own office). Change the site's payment currency to dollars, euros, rubles, pounds. The project budget is 50 Euros, but we can discuss.

Рекламна агенція Афіша Прикарпаття шукає PHP-програміста для виправлення технічних помилок на сайті ap.if.ua. Сайт написано за допомогою фреймворку Laravel, попередній програміст пояснить всі технічні деталі. Приблизна вартість всіх виправлень на сайті - 10000 грн. Можливо будуть добавлятись нові пункти, за додаткову оплату. Якщо працювати 5 днів в тиждень то все можна закінчити приблизно за пару тижнів, залежить від ваших навичок. Нам потрібна тільки людина з Івано-Франківська(та області) для того, щоб ми могли зустрічатись в офісі Афіша Прикарпаття, також при необхідності можливе виділення робочого місця.

Доброго дня. Я партнер міжнародної IT-компанії, яка займається розробкою додатків та сайтів (від звичайних лендінгів до повноцінних адмін-сторінок) для американського ринку. Ми шукаємо працьовитих і готових до навантаження PHP девелоперів. У команді мало людей, тож усі мають достатньо роботи і справді дружні між собою. Майже усі наші працівники з України, тож проблем з комунікацією немає. Більшість контактів будуть здійснюватись через менеджерів компанії та мене, тож безпосередній контакт з клієнтами англійською буде відсутній. Однак володіння англійською хоча б на простому розмовному рівні потрібне, оскільки мій парнер по бізнесу - американець, і комунікація з ним у вас буде. Розпочати роботу ви зможете після кількох етапів відбору (тест на навики та коротка скайп-розмова) та р...

Я маю довгострокову роботу, яка пов'язана з нашим попереднім проектом 'Change Framework CMS from Shopify to Prestashop - PHP, HTML, CMS, SQL'

I am on the lookout for a creative individual to assist me in making engaging travel and lifestyle vlogs for my YouTube channel. Here's what I am specifically seeking: 1. Video Production: You should be able to compile and edit raw footage into high-quality videos. Your editing skills need to be top-notch, with an ability to create compelling narratives. 2. Script Writing: In addition to the visuals, I need help with writing engaging video scripts. Your writing should be dynamic and intriguing, willing viewers to stick around for the entire video. 3. Vlog Style: I'm after a “vlog” style for my videos. Your package should transform everyday scenes into vibrant and intriguing stories. 4. Occasional Voiceover: From time to time, incorporate voiceovers into the vi...

Developer needed that hast vast experience in Vanilla PHP, JS, JQUERY and smart engine template. You will be responsible for customizing and adding new features to my existing social media site. This is long term work and you must have good experience

Overview: Working on our company web application to fix and add Handed a goal and determine best way to accomplish With our team always here to help Ability to communicate and solve exciting tasks will be essential. We all work together closely, ability to work at same times is very important Experience: 1. PHP and related such as CodeIgniter, Laravel, .. 2. JavaScript and other front end technologies 3. Mobile App Cross Platform is plus for upcoming challenge 4. PostgreSQL, My SQL, etc. Work Requirements: 1. One Dedicated Programmer working on project 2. Agreed upon start finish each day to work at same time as our team 3. Dedicated Work on Hourly Pay without other projects at same time 4. In addition to time tracking app from this site, live screen sharing In your response: ...

I want an android developer with java, php, laravel, api Working on android studio and laravel app control panel

This error has been traced back to the Apache webserver, it is a PHP and WordPress error "Please check that the mysqli PHP extension is installed and enabled." Key tasks for this project include: - Identifying the root cause of the 'Internal Server Error' message - Resolving the issue promptly to restore the website's functionality Ideal Skills and Experience: - Proficiency in PHP and Apache webserver - Strong experience in debugging and resolving 'Internal Server Error' issues - Excellent problem-solving and communication skills

Hello! Please read carefully before bidding. In a frontend web design to be converted to PHP/HTML. This is a shipping website with one main function: A shipping calculator. Custom built, no API. Primary objective: 1) Customer chooses from country and to country (Very similar to this website's interface: ). 2) After the customer gets a rate from two couriers only (UPS and FedEx) and multiple shipping services, the customer provides more information about three things: A) The sender. B) The receiver. C) The package. Then a customer checks out using Paypal. Secondary objective but not as important or could done possibly at a later phase: 1) Package tracking which possibly needs an API. 2) Basic signup and sign-in menu similar to this of

...CMS and accompanying website for my online travel agency focusing on cruise bookings. Key Features: - I would require a comprehensive booking management system. This system should be able to handle bookings, cancellations, rescheduling, and refunds efficiently. - The CMS and website should be designed to cater to both travel agency staff and end customers. User Experience: - For our end customers, the booking process should be seamless and interactive. I envision the use of an interactive calendar to allow customers to select their preferred cruise dates easily. Ideal skills for this project would include: - Proficiency in CMS and website development - Experience in e-commerce and booking management systems, particularly tailored to the travel industry - UX/U...

I need a PHP expert to integrate the Yocco Payment gateway into my existing PHP application. The primary users of this integration will be customers making purchases. Here are some specifics: - Should be able to process recurring subscriptions - A strong background in PHP and payment gateway integrations, specifically Yocco Payment, is required - Previous work with similar PHP applications will be particularly valuable - Familiarity with mechanisms for transaction confirmations via recurring subscriptions is a must-have The successful applicant will begin with this payment gateway and, contingent on excellent performance, proceed with the rest.

I need a paralegal to help me respond to a lawsuit filed against me in the Southern District of Florida. I live in Canada and am not able to travel to the USA. I received notice that the court already deemed me guilty and I have 21 days to respond to their decision. But I don't know how to respond in terms of how to compose a proper response and have it served on both the court and the law firm. Again, I need to file a response to the court and to the law firm that filed the original lawsuit and I need to do it soon, as I only have 19 days left to respond.

I'm looking for a skilled freelancer to set up my website. I need E-commerce functionality, a Blogging platform, and Contact forms to be integrated. Key Requirements: - E-commerce Functionality:... Additional Tasks: - Email Integration: Set up Microsoft 365 for email communication. - DNS & MX Record Cleanup: Remove unwanted DNS & MX Records to ensure smooth operation. - Server Setting: Make necessary setting adjustments on the server for the website to function effectively. It's important that the website has less than 10 pages. Ideal skills for this task include proficiency in PHP, WordPress, and cPanel. Experience with E-commerce, Blogging platforms, and Contact form integration is essential. Additionally, knowledge of Microsoft 365 email setup an...

I need a website developed using PHP and deployed on cPanel. Additionally, I require the following tasks to be fulfilled: - Setting up and removing DNS records - Configuring server settings - Removing unwanted MX and DNS records The site itself is intended for the purpose of email integration and a contact form. Please note that the nature of the site's content is currently undecided and may be a mix of text, images, and videos. Ideal candidates for this project should have a strong background in PHP development, cPanel deployment, and DNS record management. Experience with email integration and contact form implementation is highly preferred.

...options for my itinerary. - Loyalty program integration: It is important that the freelancer is able to apply any available loyalty programs for my travel benefits. When it comes to the hotel reservation service, I expect the following features to be included: - User reviews and ratings: It is important that the freelancer is able to find accommodations that have been positively reviewed by previous guests. - Map view: It is important that the freelancer arranges my hotel reservations in close proximity to the areas that I'll be visiting, as I am not familiar with the area. The ideal candidate for this project will have: - Previous experience with travel services and booking platforms - Excellent communication skills to ensure all bookings are aligned with my prefe...

I need a PHP website for my project management company. - The website's main purpose is for E-commerce. - I require professional services including Planning and coordination, Budget management, and Risk assessment and mitigation. - The ideal freelancer should be experienced in PHP, ecommerce websites, and have a good understanding of project management. I have a strict deadline for this project, so it is important that the freelancer can deliver the project within a month.

Hi kindly read carefully and if you can do it contact with me please otherwise not. Read a vehicle elements like (make, model, version, company name) from car ecu (Electronic Control Unit) file which is written in hexadecimal format. so your job is to find a way to read the hexadecimal file by php and find car elements from the file. I have a reference site which is developed in php and if you upload any ecu hexadicimal file then they will find car elements from the file and you will show in a form. kindly see attached file. reference site: Kindly check video: Budget: 500 USD

I'm in the market for a seasoned PHP Laravel developer with a strong grasp of PHP Laravel, especially in API creation and consumption, and relational databases. - The project will involve designing and implementing the following features: - User Registration - Payment System - Gambling Games - Multi-level System: Admin, Agents, Players This project is specifically targeting recreational players. The games that should be included are Slot Machines and Roulette. The ideal candidate for this project should have a strong background in: - PHP Laravel - API creation and consumption - Relational databases Experience in developing casino projects would be a big plus. You should be able to take ownership of the project, deliver high-quality code, and ensure ...

...Comprehensive end-to-end training in Unix/Linux, JSP, HTML, Core Java, Node JS, Node red, Oracle SQL, and PLSQL. Exciting projects in the banking domain Opportunities for growth and career advancement Terms and Conditions: Commitment: Minimum 3 years with us Training: First month (free accommodation), followed by competitive salary Performance-based increments from the second year onward Global travel opportunities Qualifications: - While we do not have any specific certifications or qualifications in mind, a degree in Computer Science or a related field is preferred. This is an exciting opportunity to join a dynamic team and contribute to the development of our software. If you have the skills and experience, we're looking for, we'd love to hear from you. Required...

I am seeking an experienced video editor and social media manager who can convert my collection of photos and videos into a 20-second Instagram travel reel. The subject of the reel will be Indian temples, with a mix of chosen locations and editor suggestions. The style should be historical and informative. Key tasks include: - Editing the supplied footage to meet the desired duration and thematic style - Downloading additional images or clips as needed for the reel - Ensuring high-definition output quality - Researching and recommending specific temples that align with the project requirements Ideal candidates will have: - Expertise in video editing and Instagram content creation - Understanding and/or interest in Indian temples, culture, and history - Ability to balance clien...

I'm seeking a proficient, detail-oriented PHP developer to shape an e-commerce website on WooCommerce for my business. The website will need to feature: • A seamless user registration and login mechanism ensuring frivolous sign-ups are at a minimum. • Robust payment gateway integration, making online transactions secure and efficient. • Social media integration enabling connectivity with multiple platforms. A solid background in PHP development, WooCommerce, and e-commerce web development is crucial for this project. Experience with payment gateway integration and social media integrations will also be highly beneficial. The goal is to create a smooth online selling experience for our customers. An ideal freelancer would share my enthusiasm for perfectio...

I need a PHP developer to update a single word in my script. Specifically, I want to add the country Montenegro to a pre-existing list, and have it inserted in the middle. The ideal candidate for this task should be proficient in PHP and have a good understanding of basic coding principles. Experience in handling string manipulation within PHP scripts is important, as you'll be required to ensure the country name is inserted accurately and efficiently. Your responsibilities will include: - Identifying the appropriate place to insert the word 'Montenegro' in the PHP script - Making the necessary changes to the script to reflect the updated country list Your bid should reflect the size and scope of this task. Looking forward to your bids!

I'm looking for a skilled Virtual Assistant based in Malaysia to help me with sales activities, it's 2hours task daily. Commission based. Your primary focus will be to go t...would be a plus. You need to be proactive, excellent at communication and a quick learner. Your tasks will involve: - Conducting sales activities - Reporting on sales activities and results -being on time. As a Virtual Assistant, you'll mostly be working remotely. However, I may need you to visit the physical store occasionally. so please consider your location in Malaysia and your ability to travel as needed. If you have a sales-oriented mindset, are comfortable with cold calling and follow-up emails, and have experience in a sales role, I'd love to hear from you. Prior experience wi...

I am currently in need of an experienced PHP developer for an upcoming project. The specific tasks and objectives have yet to be defined, so I am looking for someone who is adaptable and skilled in all areas of PHP, from front-end development to back-end development and database management. Skills/Experience Required: - Proven experience in front-end and back-end PHP development - Knowledge and experience in database management - Ability to work in different frameworks and technologies such as Laravel, CodeIgniter The qualified candidate should be ready to use different frameworks and technologies as per the project's needs. If you are skilled, adaptable, and up for the challenge, let's get in touch.

...their travel itineraries. - 1-1 Chat: A feature for private communication between users. - Create Travel Groups: Ability to create and join groups based on travel interests. - Explore Interests: Users should be able to discover and share their interests while traveling. - Explore Countries: Information and resources for understanding different countries. Ideal Skills and Experience: - Proficiency in both Android and iOS app development - Experience with social networking app development - Previous work with location-based services and trip planning features - Strong understanding of cross-platform development tools and practices - Prior experience in developing chat and group creation features - Familiarity with travel apps and interest in solo travel...

As the project approaches completion, I am in need of a seasoned PHP developer to perform system enhancements. There's already an existing system at hand that could use your expertise to make it more efficient and user-friendly. The ideal candidate would possess the following skills and experience: - Proficiency in PHP development and database management - Experience in API integration - Strong understanding of the software development life cycle - Proven track record of enhancing existing systems - Detail and solution-oriented mindset Please take note that specific tasks can't be provided at this moment, all we need is to enhance the system. Your rate should reflect this requirement.

...develop an application that seamlessly connects travelers on both iOS and Android platforms. This app's core functionality is to foster a vibrant travel community and facilitate interaction between its users. Key Features: - Personalized Recommendations: The application should be able to provide tailored suggestions to users based on their preferences and previous interactions. - 1-1 Chat: In-app messaging feature to enable private conversations for users. - Nearby Users: It's important that the app can identify and display other users nearby, to promote physical meetups. - Interests: The app should have a mechanism for users to list their travel interests and preferences, which can then be used for matching and recommendation purposes. Ideal candidates shoul...

...description, and use the meta description as the alt text by default if there is nothing entered. Have a very versatile form system including a custom form like this:  Convert current tags to WP tags Must connect to our review system (check reviews at the bottom of this page) The site must have a very clean and professional feeling while inspiring travel. Primary colors must be tropical orange, green, and blue. Our current (custom) CMS stores all data points such as page title, parent page blurb, content for the first paragraph, all additional content, etc. This all must be converted to WordPress and there must be dynamic connections for everything to our database, just as it currently is set up. Most of your images are currently 680x340 in siz...

I'm in need of a skilled professional who can take care of the following tasks: - Website Maintenance: As my website is built on WordPress, I'm looking for someone with strong experience in this platform. Your role will involve ensuring that the site is functioning optimally, fixing any bugs, updating plugins, and making sure everything runs smoothly. - Content Creation: The person should be capable of creating engaging, SEO-optimized content. This content should be aimed at generating leads, therefore a good understanding of lead generation tactics is essential. - Branding: I need help with branding strategies to make sure my website is aligned with my brand's values and message. - Online Presence Management: This involves managing all online platforms related to the...

I need PHP and flutter experts only Bangladeshi. Who help me to reskin this full project. Mobile app and Web.

...create an engaging and creative website. This is for my client who wants a fresh redesign of their website with a fresh and professional look. The website is a very basic 5 page website with no extra functionality required other than a basic contact form. I have already made a start on the project but no longer have time to complete it so I need to outsource the project. The website is a basic travel/retreat website I have already installed and set everything up I just need the winning bidder to create a great redesign of the site using Elementor. The winning bidder must have previous experience with Elementor for Wordpress with previous proof of work/portfolio. Please start your bid with the word rebel so I know you read and understood this. Summary 5 page website redesi...

I am seeking specialized teachers for virtual classes. These leaders should be well-versed in health and wellness topics for older adults Expertise Required: Cinema and Art Music and Literature History Travel Hobbies Memory Games Trivia Health Care & General Wellness Staying Healthy as We Age Happiness Wellness and Lifestyle Music Entertainment Open to ALL new ideas also! Applicants should understand various facets of each topic to provide comprehensive lessons. Prior experience in teaching these subjects would be beneficial. Along with teaching, the ideal applicants would possess excellent interpersonal and motivational skills. Let's promote wellness together!

I'm in need of a graphic designer that is experienced in creating modern, minimalist logos. The project involves designing a logo for my new business, TCL Travel. It is a travel company offer visa and travel services to customer . It is mainly international travel Please create one nice logo The desired color scheme is blue and gray. The logo must be able to represent the business well and should be original. Effectively, it should convey quality, trust and professionalism while also exuding some excitement of travel. Ideal Skills: • Graphic Design • Logo Design • Illustrator • Experience with modern and minimalist designs. Looking forward to seeing your portfolio and potentially working together.

I am looking for a talented video editor who can help turn my travel footage into a captivating vlog-style video. - The primary goal of this video is to promote a travel destination. Therefore, it's important for you to be able to create a video that is engaging and will inspire viewers to visit the destination. Ideal Skills and Experience: - Proficient in video editing software - Experience in editing vlog-style videos - Understanding of storytelling through video - Creative with a strong attention to detail - Previous experience editing travel videos would be a plus Please provide examples of your previous work, particularly any similar travel videos you have edited. Your understanding of creating a vlog-style video that promotes a destination is cruc...

I'm seeking a developer with relevant experience in PHP scripting, Google Ads API and Windows OS to provide me with a script that will help with my Google Ads functions. This functionality entails both Keyword Planner integration and a Server-to-Server flow setup. Your tasks will be: • to integrate the Google Keyword Planner into the script, • to set up a server-to-server flow on a Windows operating system, • to ensure compatibility with PHP 8.0. Your understanding of Google Ads API for keyword planning and server interaction flow will be pivotal to this project. Prior experience with these tools will set you apart. Efficiency, accuracy, and an application that runs smoothly are key to the success of this project. Please be prepared to offer examples ...

I need a PHP website developed, with specific functionalities catering to a particular audience. I'm looking for a skilled PHP developer to create a website for me. While the exact purpose of the website is yet to be determined, I'd like it to be versatile and user-friendly. Ideal skills and experience for this project would include: - Proficiency in PHP, HTML, CSS, and JavaScript - Experience in designing and developing user-friendly websites - Ability to create dynamic and interactive web pages - Understanding of various web security issues and how to prevent them While the target audience is not specified yet, the website should be designed with a potential business audience in mind. This means a professional look and feel, and functionalities that mig...

I require an experienced video editor who can put together city exploration videos in a vlog style. The project involves editing raw footage to create engrossi...Incorporating elements of street interviews and covering food and local delicacies - Editing self-vlogging content into a captivating final product Ideal Candidate: - Proficient in using advanced video editing software - Background in travel vlog editing is highly advantageous - Experience in creating engaging and appealing vlog-style videos - Able to effectively incorporate diverse footage elements in a cohesive manner This project calls for someone who is creative, has a good understanding of storytelling through visual medium, and is well-versed in the travel vlog genre. If you're up for the challenge, I�...

I'm in search of a skilled PHP Laravel developer based in Dhanbad, Jharkhand, for a full-time role. The chosen candidate will be instrumental in the creation of a new website. Key Responsibilities: - Front-end Development: A strong foundation in front-end development is crucial for this role. You need to be able to create intuitive and responsive user interfaces. - Back-end Development: Proficiency in Laravel, a popular PHP framework, is essential to build a robust back-end for the website. - Database Management: Your expertise in managing databases will be pivotal in ensuring the site operates seamlessly. The primary focus of the project is: - Building a new website: You will be responsible for developing a new website from scratch. Your ability to translate design co...

I am looking for an experienced developer to help me create a minimalistic PHP web app that can perform a few key actions - user registration, send email notifications and generate reports. Key Requirements: - User Registration: The app should have a simple user registration system. - Email Notifications: It should also be able to send email notifications to users. - Report Generation: The app needs to have the capability to generate reports. I'd like to gauge the freelancers' skills and competence based on their past work, so please include examples of your previous projects in your application. Ideal Skills and Experience: - Strong PHP development skills - Experience in creating user registration systems and handling email notifications - Familiarity with repor...

I'm in need of an experienced PHP developer who can perform a thorough inspection and subsequent modification of my web application. Here is what the project will entail: - **Design Modification:** The application's design needs some tweaking to achieve the desired look and functionality. If you had prior experience with UI/UX, it would be fantastic. - **Functionality Enhancements:** Some parts of the app aren’t functioning the way they should, therefore need some enhancements to improve usability and the overall user experience. Ideal candidates should have a profound understanding of PHP, as the code is written in this language. Prior experience in working with web application optimization, user interface design, and functionality improvements would be be...

I'm seeking a talented developer to create a flight booking web platform that leverages artificial intelligence. The ideal candidate will have a deep understanding of both web development and AI technology to deliver a user-friendly and efficient booking tool. The site is partly develope...entails: - Development of an AI-driven flight search and booking platform - To be exclusively used in a web format - Priority is quick project completion, as I need this done ASAP Attached are the specific tasks required Sigma design is ready and beta site is online Ideal skills and experience: - Proficiency in AI technology - Extensive web development experience - Previous work in the travel or airline industry would be a big plus - Ability to work under tight deadlines without sacr...

...dedicated remote team for the full-scale development of a cross-platform ERP Travel App using React Native. Key Features: - Robust Booking System: The app should have an efficient booking system to handle reservations. - Seamless Payment Integration: A secure payment gateway that supports multiple payment modes. - Multi-Language Support: The app should cater to a global audience by supporting multiple languages. - Accounting Integration: The app should be built with an accounting system. - In-App Chatbot: A sophisticated chatbot to assist users and provide support. Platform Compatibility: - The ERP Travel App should be compatible with: - iOS - Android - Web Target Audience: - The app is targeted at: - Travel agencies - Individual travelers - Business ...

I'm looking for a skilled and experienced developer to help update and optimize our existing app for our business. Contact Number 7999978O355 Key Goals: - Optimize the performance of our current app - Maintain its high standard of quality and usability Ideal Skills and Experience: - Proven experience in PHP and/or Android development - Ability to effectively optimize app performance - Understanding of business app requirements and best practices For this project, the primary focus will be on performance enhancement. This will require a diligent and detail-oriented approach to ensure that the app continues to work seamlessly for our customers. The successful candidate will not only have a strong technical background but also an ability to understand and work within an existi...

I am seeking a talented web designer to help build an engaging website that really catches the eye. This site will be for my medical tourism consultancy - taking the form of a virtual clinic, it will need to reflect the highest standards of professionalism. Key Features: - Structured, well-organ...design skills - Coding skills such as HTML/CSS or JavaScript are a plus - Ability to incorporate a simple booking/contact system Your portfolio showing previous work in a related industry will be highly valued. So, if you possess these skills and have the credentials to back it up, jump on this opportunity. Let's build the best medical tourism consultant website out there. Plastic surgery Tourism travel in Bali and Thailand in the Bumrungrad International hospital in Thailand and th...

Travel guide who can follow the pre planned itinerary and lead small group of people

I'm in need of a captivating and vibrant logo to represent my travel agency, focusing specifically on adventure travel. Details are as follows: - Given the absence of my preference for a specific style, the designer will have the creative freedom to choose between a modern, classic, or minimalist style. However, the design must reflect and promote the exciting and thrilling nature of adventure travel. - The color scheme should predominantly feature orange and yellow, reflecting warmth, energy, and positivity. - The design must be creative and unique, capturing the essence of our agency's focus on adventure travel. Ideal candidates for this job should have: - Proven experience in logo design - Creative thinking leading to distinctive and memorable de...

I'm in need of a skilled developer with a strong background in PHP, particularly in backend development. The project involves creating a simple e-commerce website with less than 5 pages. This site will function as an online store, primarily focused on selling products or services. Ideal skills and experience: - Proficiency in PHP - Experience in backend development - Previous work in e-commerce websites - Understanding of user registration and login systems - Knowledge of database integration