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Posted by Marek Kilimajer on 06/03/05 18:25
Brian Dunning wrote:
>
> On Jun 3, 2005, at 6:48 AM, Marek Kilimajer wrote:
>
>> Brian Dunning wrote:
>>
>>> I am using a routine to find 50 random records in a large MySQL
>>> database (about a million records) where I generate a list of 50
>>> random unique ID's,
>>>
>>
>> why can't you use the where condition in the above query?
>
>
> Because I wouldn't get all 50 records that I need - I'd only get the
> few out of the 50 that happened to be in the needed subset.
>
I don't think you get me or I don't get you. Currently you are doing:
1. select id from table order by rand() limit 50
2. select * from table where id in($random_set)
right?
I meant why not use the where condition in the first query.
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