How to fix the Oracle error PLS-00489: invalid table reference: ‘string’ must be a column in this expression?

In this post, you’ll learn more about the Oracle ErrorPLS-00489: invalid table reference: ‘string’ must be a column in this expression with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00489: invalid table reference: ‘string’ must be a column in this expression

Reason for the Error PLS-00489: invalid table reference: ‘string’ must be a column in this expression

In a query, a select-list item refers to a table in the FROM clause but not to a database column.

How to fix the Error PLS-00489: invalid table reference: ‘string’ must be a column in this expression ?

You can fix this error in Oracle by following the below steps

Check the spelling of the column names, make sure each column in the select list refers to a table in the FROM clause, then re-execute the query.