On Wed, 2009-02-04 at 14:42 -0800, PHP wrote:
> Hi all,
> I am seeking some knowledge, hopefully I explain this right.
>
> I am wondering what you think is faster.
>
> Say you have 1000 records from 2 different tables that you need to get from a MySQL database.
> A simple table will be displayed for each record, the second table contains related info for each record in table 1.
>
> Is if faster to just read all the records from both tables into two arrays, then use php to go through the array for table 1 and figure out what records from table 2 are related.
>
> Or, you dump all the data in table 1 into an array, then as you go through each record you make a database query to table 2.
>
>
>
>
> PS:
> I know I can use a join, but I find anytime I use a join, the database query is extremely slow, I have tried it for each version of mysql and php for the last few years. The delay difference is in the order of 100x slower or more.
Grab records from table 1... build a list of IDs to match in table 2.
Use an IN clause. 2 queries and no joins as you requested.
SELECT * from foo_table AS FOO where "something something";
SELECT * from fee_table AS FEE where foo_id IN ( list, of, ids );
You REALLY don't want to do a query for every row matched in the first
query.
Cheers,
Rob.
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