PLS-00489: invalid table reference: 'string' must be a
column in this expression
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Answer / guest
Cause: In a query, a select-list item refers to a table in
the FROM clause but not to a database column.
Action: 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.
Please add more information about this Error
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