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SELECT a FROM b
UNION ALL
SELECT a FROM c
UNION ALL
SELECT a FROM d
Does UNION ALL guarantee to print out records from tables b, c, d in that order? I.e., no records from c before any from b. This question is not for a specific DBMS.
No order by, no order guarantee whatsoever – that’s for every database.
And for standard SQL, an ORDER BY is applied to the results from all the unioned queries.