where clause - How do I make my MySQL Qyery with an "IN" statement faster? -


my query runs quite slow. have 2 lare query's on page. has become running slow since have insert "in" statement.

    select field1, field2, field3, field4, field5, field6,             date_format(field7, '%d-%m') field7_1,             date_format(fjield8, '%d-%m') field8_1                table1             field9 in (select field1 table2 id = '$id_session') or        field10 in (select field1 table2 id = '$id_session')     order         field7_1 desc    limit         50, 100";

i think problem part "where field9 in (select field1 table2 id = '$id_session')" searching in table values have in clause.

it taking 8 sec load slow. have reduced number of records in database, not make faster.

please help.

you can refactor queries using in use join instead.


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