---
layout: global
title: INVALID_SUBQUERY_EXPRESSION error class
displayTitle: INVALID_SUBQUERY_EXPRESSION error class
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[SQLSTATE: 42823](sql-error-conditions-sqlstates.html#class-42-syntax-error-or-access-rule-violation)

Invalid subquery:

This error class has the following derived error classes:

## SCALAR_SUBQUERY_RETURN_MORE_THAN_ONE_OUTPUT_COLUMN

Scalar subquery must return only one column, but got `<number>`.


