A subquery, also known as an inner query or nested query, is a query nested within another SQL query. Subqueries are often used to retrieve data that will be used in the main query to further filter, ...

For example, you can use a correlated subquery to find the customers who have placed orders above the average order amount of their region. Add your perspective Help others by sharing more (125 ...

*Summary of 102 LeetCode SQL questions* This note aims to help people learn and review SQL efficiently. The first draft mainly focuses on T-SQL/MS SQL Server. - aysnrdurak/SQL-Notes-and-LeetCode-E ...