What is multi column subquery in Oracle?

Can subquery have multiple columns?

SQL: Multiple Column Subqueries You can write subqueries that return multiple columns. The following example retrieves the order amount with the lowest price, group by agent code.

What is column subquery?

If you want compare two or more columns. you must write a compound WHERE clause using logical operators Multiple-column subqueries enable you to combine duplicate WHERE conditions into a single WHERE clause. Using Multiple-Column Subqueries.

What are the different types of subquery in Oracle?

Types of SQL SubqueriesSingle Row Subquery. Returns zero or one row in results.Multiple Row Subquery. Returns one or more rows in results.Multiple Column Subqueries. Returns one or more columns.Correlated Subqueries. ... Nested Subqueries.

What is a subselect in SQL?

Subselects, also called subqueries, may be just what you've been looking for. 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.