id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cl const PRIMARY, classification classification 767 const 1 Using temporary; Using filesort
1 SIMPLE of ref PRIMARY, idfile PRIMARY 5 const, const 1 Using where
1 SIMPLE fc eq_ref PRIMARY, idclassification PRIMARY 8 theatreok_dev.of.idfile, const 1
1 SIMPLE f eq_ref PRIMARY, idtypefile PRIMARY 4 theatreok_dev.of.idfile 1 Using where
1 SIMPLE tf eq_ref PRIMARY PRIMARY 2 theatreok_dev.f.idtype 1