In SQL Server 2017, automatic plan correction was added, which allows for the database engine to automatically use the "last known good plan" for a query that has suddenly regressed in performance.

Dynamic SQL lets you create a query string based off of user input. SQL Server allows you to create dynamic SQL statements. The statements use a SQL string varchar data type, then you execute the ...

Using SQL for Data Analysis. ... Common Table Expressions (CTEs): Break down complex queries into manageable parts using CTEs, enhancing query readability and maintainability.

This SQL feature allows you to query within a result set, creatively limit your result set, or correlate your results with an otherwise unrelated query in a single call to the database.