Le SQL est un langage qui permet de manipuler les données et les bases de données relationnelles. Fondamental pour le RAG Retrieval-Augmented Generation) et l’optimisation des IA, il est plus que ...
SUM(CASE WHEN year_id = 2023 THEN sales ELSE 0 END) AS sales_2023, SUM(CASE WHEN year_id = 2024 THEN sales ELSE 0 END) AS sales_2024, SUM(CASE WHEN year_id = 2024 ...
Mastering SQL is an essential skill for anyone pursuing a career in IT, regardless of whether you aspire to be a developer, data scientist, IT manager, or machine learning engineer. Understanding how ...
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Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...
A database query is a request for data from a database. It’s a way for a user or a program to retrieve data stored in a database by asking questions about the data. But how do you do that? In part 1 ...
Have you ever been stumped by a SQL question in a data science interview? If so, you’re not alone. All data roles across the board—data analyst, data scientist, data engineer, (insert your dream role ...
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