Common Table Expressions (CTEs) are temporary, named result sets defined within a single SQL statement. They enhance query readability and reusability by breaking down complex queries into smaller, manageable parts.
WHERE and HAVING are both used for filtering data in SQL, but they operate on different levels. WHERE filters rows before any aggregation, while HAVING filters groups after aggregation.
Window functions in SQL allow you to perform calculations over a set of rows related to the current row without grouping the data. They are powerful tools for analyzing data within a specific context.
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