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3

If any "check for existence" query returns more than one row, I think it is more useful to double check your WHERE clause instead of LIMIT-ing the number of results.

Martin Schapendonk
– Martin Schapendonk

2010-11-23 08:25:01 +00:00
Commented Nov 23, 2010 at 8:25
2

I think Limit is used in Oracle and not in SQL Server

Shantanu Gupta
– Shantanu Gupta

2010-11-23 08:26:10 +00:00
Commented Nov 23, 2010 at 8:26
7

I'm considering the case where they can legitimately be multiple rows -- where the question is: "Is there (one or more) rows that satisfy this condition?" In that case, you don't want to look at all of them, just one.

JesseW
– JesseW

2010-11-23 08:26:30 +00:00
Commented Nov 23, 2010 at 8:26
1

@Shantanu -- I know, that's why I linked to the (very through) en.wikipedia article explaining the other forms.

JesseW
– JesseW

2010-11-23 08:27:52 +00:00
Commented Nov 23, 2010 at 8:27

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