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What is subquery in SQL Server?
A subquery is a query that is nested inside a SELECT , INSERT , UPDATE , or DELETE statement, or inside another subquery.
Should I use CTE or subquery?
CTE can be more readable: Another advantage of CTE is CTE is more readable than Subqueries. Since CTE can be reusable, you can write less code using CTE than using a subquery. Also, people tend to follow logic and ideas easier in sequence than in a nested fashion.
Why we use subquery in SQL Server?
A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved. Subqueries can be used with the SELECT, INSERT, UPDATE, and DELETE statements along with the operators like =, <, >, >=, <=, IN, BETWEEN, etc.
