Query;
SELECT *
FROM TOV_Component_Statuses UNION ALL
SELECT *
FROM TOV_TCU_Progress;
Result
Msg 205, Level 16, State 1, Line 2
All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.
All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.