What is multiple column subquery in SQL?

Question

Multiple-column subqueries enable you to combine duplicate WHERE conditions into a single WHERE clause. Column comparisons in a multiple-column subquery can be pairwise comparisons or nonpairwise comparisons. You can use a subquery to define a table to be operated on by a containing query.

Can we select multiple columns in 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.

Can you do multiple subqueries in SQL?

Multiple row subquery returns one or more rows to the outer SQL statement. You may use the IN, ANY, or ALL operator in outer query to handle a subquery that returns multiple rows.

What is multi column subquery in Oracle?

Answer: A multi-Column Subquery is simply a subquery that returns more than one column. Here is a working example of a multi-column subquery: SQL> select.

What is multiple subquery in SQL?

Multiple-row subqueries are nested queries that can return more than one row of results to the parent query. Multiple-row subqueries are used most commonly in WHERE and HAVING clauses. Since it returns multiple rows,it must be handled by set comparison operators (IN, ALL, ANY).

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