1364
1364
id select_type table type possible_keys key key_len ref rows Extra
1365
1365
1 SIMPLE t1 index NULL PRIMARY 4 NULL 144
1366
1366
EXPLAIN SELECT a FROM t1 FORCE INDEX ();
1368
1368
EXPLAIN SELECT a FROM t1 IGNORE INDEX ();
1370
1370
EXPLAIN SELECT a FROM t1 USE INDEX FOR JOIN (i2)
1371
1371
USE INDEX FOR GROUP BY (i2) GROUP BY a;
1372
1372
id select_type table type possible_keys key key_len ref rows Extra