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A subquery is a query that is nested inside another query statement. It is also called an inner query or inner select, while the statement containing a subquery is also called an outer query or outer select. Many SQL statements that include subqueries can be alternatively formulated as joins. Other questions can be posed only with subqueries.
Subqueries are used to return data that will be used in the main query as a condition to further restrict the data to be retrieved. They can also be used to retrieve data that will be used in the processing of the main query.
For example, if you want to retrieve all employees who work in departments with more than 10 employees, you can use a subquery as follows:
WHERE department_id IN (
GROUP BY department_id
HAVING COUNT(*) > 10
This query retrieves all employees whose department_id is in the list of department_ids returned by the subquery. The subquery returns only those department_ids that have more than 10 employees.
In summary, subqueries are used to retrieve data that will be used in the processing of the main query or as a condition to further restrict the data to be retrieved.
Here are some websites that discuss What Is A Subquery:
– [Microsoft Learn](https://learn.microsoft.com/en-us/sql/relational-databases/performance/subqueries?view=sql-server-ver16)
– [Google Cloud](https://cloud.google.com/bigquery/docs/reference/standard-sql/subqueries)
– [SQL Tutorial](https://www.sqltutorial.org/sql-subquery/)