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Toreador (3/9/2012)
sqlmunkee (3/9/2012) Even if you hadn't added the constraint to the table, the second program would still fail because there would already be the temp table from the first program.
sqlmunkee (3/9/2012)
That's...
March 9, 2012 at 4:16 am
#1457057
Really a nice question, make me learn more about this basic knowledge.
However, in real case, we really seldom use "Union" and "Union all" together just like the questions. always use...
March 9, 2012 at 4:07 am
#1457054