On 3/9/2010 8:04 AM, P Kishor wrote:
>
>> select min(88,99) from T where 1=2 // returns 0 rows
>>
> The above is correct SQL and the answer is correct. Per the docs,
> "Note that min() is a simple function when it has 2 or more arguments
> but operates as an aggregate function if given only a single
> argument."
>
> Finally, note that when returning both aggregate and non-aggregate
> columns, you should use the GROUP BY clause. I believe that SQLite
> will return rows even without GROUP BY, but the answer may be
> undependable.
>
Of these three:
select c from T where 1=2 // returns 0 rows
select min(c) from T where 1=2 // returns 1 row
select min(88,99) from T where 1=2 // returns 0 rows
the only case that "threw" me is the second one, where a row is returned
despite a WHERE condition that should yield an empty set (or so I thought).
Regarding your point about the GROUP BY clause -- I'm not sure what you mean by
"non-aggregate columns". Are you referring to a query where one wants to find
the minimum value in a given column for the /entire/ table?
select min(askingprice) from cars4sale
group by rowid //<= a group by is required here?
Regards
Tim Romano
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