On Tue, 12 Jan 2010 16:12:01 -0500, Qianqian Fang
<fan...@gmail.com> wrote:
>On 1/12/2010 4:08 PM, Jay A. Kreibich wrote:
>> SELECT group_concat( value ) FROM mydata WHERE id IN ( 'id_1', 'id_2', ... )
>>
>
>hi Jay
>
>thank you very much for your quick response. I guess this will be
>significantly faster than looping through each id.
It isn't faster than getting the same information with
SELECT value FROM mydata
WHERE id IN ('id_1','id_2',...,'id_N');
This returns:
value1
value2
:
valueN
whereas
SELECT group_concat(value) FROM mydata
WHERE id IN ('id_1','id_2',...,'id_N')
returns:
value1,value2,...valueN
But you're right, it is certainly faster than
for i=1;i <= N; i++){
"select value from mydata where id='id_$i'"
}
>One more question, will this work if you have a long list of ids (say
>a few hundred)?
>
>thanks
>
>Qianqian
Hope this helps,
--
( Kees Nuyt
)
c[_]
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