--UNION
SELECT 'A' AS FIRST_RECORD FROM DUAL
UNION
SELECT 'A' SECOND_RECORD FROM DUAL
UNION
SELECT 'B' THIRD_RECORD FROM DUAL;
--UNION ALL
SELECT 'A' AS FIRST_RECORD FROM DUAL
UNION ALL
SELECT 'A' SECOND_RECORD FROM DUAL
UNION ALL
SELECT 'B' THIRD_RECORD FROM DUAL ALL;
UNION VS UNION ALL
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