How do I fix single row subquery returns more than one row?

How do I fix single row subquery returns more than one row?

The first is to rewrite the query so that the subquery will only return a single row, thus eliminating the source of the error. This will require a user to rethink how they wish to acquire the data that they were initially searching for.

What if subquery returns more than one row?

The value of the scalar subquery expression is the value of the select list item of the subquery. If the subquery returns 0 rows, then the value of the scalar subquery expression is NULL . If the subquery returns more than one row, then Oracle returns an error.

Can a single row subquery return more than one column?

Single Row Sub Query Although this query type is formally called “single-row,” the name implies that the query returns multiple columns-but only one row of results. However, a single-row subquery can return only one row of results consisting of only one column to the outer query.

Can a single row subquery fetch data from more than one table?

A single row subquery can retrieve data from more than one table. A single row subquery cannot be used in a condition where the LIKE operator is used for comparison. F. A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.

What operator is used to prevent the error ORA 01427 single row subquery returns more than one row?

IN operator is used to prevent the error: ‘ORA-01427:single row sub query returns more than one row’. IN operator is used to specify which values to compare or reword the query so only one row is retrieved.

What is subquery in SQL?

A subquery is a query that is nested inside a SELECT , INSERT , UPDATE , or DELETE statement, or inside another subquery. A subquery can be used anywhere an expression is allowed.

What operator is used to prevent the error ORA-01427 single row subquery returns more than one row?

What is single row subquery and multiple row subquery?

There are two types of subqueries: Single-row: returns only one row of data. Multiple-row: returns more than one row of data.

Can a subquery return 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.

Can be used with multiple row subquery?

Operators that can be used with multiple-row subqueries include IN, ALL, ANY, and EXISTS. 10.

How do I allow multiple rows to return subquery?

You may use the IN, ANY, or ALL operator in outer query to handle a subquery that returns multiple rows….Contents:

1. Using IN operator with a Multiple Row Subquery.
2. Using NOT IN operator with a Multiple Row Subquery.
3. Using ANY with a Multiple Row Subquery.
4. Multiple Column Subqueries.
5. SQL subqueries using DISTINCT.

Can subquery return multiple columns?

Can a single row subquery return only one row?

However, a single-row subquery can return only one row of results consisting of only one column to the outer query. In the below SELECT query, inner MySQL returns only one row i.e. the minimum salary for the company.

Why does select statement return more than one row?

This is because the subquery in the SELECT statement returned more than one row for the predicate department_id, which does not comply with a singular value limited operator, the equal =. Consequently, the statement fails to continue and then throw ORA-01427 to notify developers.

How to avoid ora-01427 single row subquery?

A similar exception that relates to returned number mismatch is ORA-00913: too many values. But they have different error patterns. More comparison conditions like ANY, SOME or ALL should also be helpful to accept more than one row in your statements so as to avoid ORA-01427 in subquery statement.

Can a subquery be compared with a group function?

If a subquery’s result must be compared with a group function, you must nest the inner query in the outer query’s HAVING clause. Multiple-row subqueries are nested queries that can return more than one row of results to the parent query.