Changying Li schrieb:
why does mysql use group_id index ?
because in this case group_id would be faster than user_id
but in fact group_id is very slow (51.21 sec), user_id is (0.00 sec)
ok, at least MySQL does think so
I know, but I what I really want to know is how does mysql think so ?
Sebastian Mendel [EMAIL PROTECTED] writes:
Changying Li schrieb:
why does mysql use group_id index ?
because in this case group_id would be faster than user_id
but in fact group_id is very slow (51.21 sec), user_id is (0.00 sec)
ok, at least MySQL does think so
I know, but I what I really
Hi. there is a table photo and two queries:
mysql show index from photo;
mysql show index from photo;
Changying Li schrieb:
Hi. there is a table photo and two queries:
mysql show index from photo;
mysql
show index from photo;
Sebastian Mendel [EMAIL PROTECTED] writes:
Changying Li schrieb:
Hi. there is a table photo and two queries:
mysql show index from photo;
mysql show index from
Changying Li schrieb:
Sebastian Mendel [EMAIL PROTECTED] writes:
Changying Li schrieb:
Hi. there is a table photo and two queries:
mysql show index from photo;
mysql
why does mysql use group_id index ?
because in this case group_id would be faster than user_id
but in fact group_id is very slow (51.21 sec), user_id is (0.00 sec)
ok, at least MySQL does think so
I know, but I what I really want to know is how does mysql think so ?
how to let mysql choose
