sql query joins multiple tables - too slow (8 tables)

Question

i\'m trying to join 8 tables into one in order to create index used by other application, my query is like : (my mysql skill\'s very amateur)

SELECT t1_id, t         


        

Answer 1

If you need all the rows of t1, and you left join on the primary key (I guess it's also the clustered index) of the other tables, there is no way to improve the speed of the query.

To improve performance you either need to reduce the result set or perform a nasty trick (eg make a denormalized copy of the data).