Am 12.02.2012 23:25, schrieb Cabbar Duzayak:
> Hi All,
>
> I have a table with a btree index on its searchKey column, and when I
> send a simple query on this table:
>
> explain select * from DataIndex where (searchKey like 'A%') order by
> searchKey limit 10
>
> rows is returning 59548 and it tells me that it is using the searchKey index.
>
> Also, a select count(*) on this table returns 32104 rows, i.e.
>
> select count(*) from DataIndex where searchKey like 'a%' -> gives
> 32104 as its result
>
> Am I doing something wrong here? Given that the searched column is
> indexed, shouldn't it examine way less rows?
LIKE does not benefit from keys!
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