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Message Posted: Tue, 02 Sep 2003 @ 20:51:10 GMT


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Subj:		Re: MINUS ALL -vs- NOT EXISTS -vs- NOT IN

From:		Dieter Noeth

Anomy Anom wrote:

Just MINUS will return the same number of rows as NOT EXISTS, but MINUS ALL is different, it checks for duplicates row by row, e.g.:

set1

1
1
1

MINUS

1

will return 0 rows

but

1
1
1

MINUS ALL

1

will return 2 rows:

1
1

btw, i still didn't find any real world problem to be solved using MINUS ALL, anyone ever used it at all?

Dieter


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