In the provided SQL example, how does the subquery in the WHERE clause function?
Understand the Problem
The question is asking about the function of a subquery within the WHERE clause of an SQL statement, specifically how it influences the selection of data based on salary and performance metrics.
Answer
In WHERE clauses, subqueries filter outer query results using comparison operators or keywords like IN or EXISTS.
The subquery in a WHERE clause functions by providing data used to filter the results of the outer query. It can use comparison operators or keywords like IN or EXISTS to compare the subquery result against the outer query data.
Answer for screen readers
The subquery in a WHERE clause functions by providing data used to filter the results of the outer query. It can use comparison operators or keywords like IN or EXISTS to compare the subquery result against the outer query data.
More Information
Subqueries in the WHERE clause are useful for narrowing down search results by making decisions based on conditions evaluated by the subquery.
Tips
A common mistake is expecting a subquery in the WHERE clause to return multiple rows for use with comparison operators when it should return a single value.
Sources
- SQL Subqueries - w3resource - w3resource.com
- Including subqueries in the WHERE or HAVING clause - IBM - ibm.com
- SQL | Subquery - GeeksforGeeks - geeksforgeeks.org
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