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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE cat index PRIMARY name 194 1 100.00 Using index; Using temporary; Using filesort
1 SIMPLE sch eq_ref PRIMARY, catalog_id catalog_id 202 mysql.cat.id, const 1 100.00 Using index
1 SIMPLE tbl eq_ref PRIMARY, schema_id schema_id 202 mysql.sch.id, const 1 100.00 Using where
1 SIMPLE col ref table_id, table_id_2, collation_id table_id 8 mysql.tbl.id 8 100.00 Using where
1 SIMPLE coll eq_ref PRIMARY, character_set_id PRIMARY 8 mysql.col.collation_id 1 100.00
1 SIMPLE cs eq_ref PRIMARY PRIMARY 8 mysql.coll.character_set_id 1 100.00