MySQL EXPLAIN语句中的extended 选项介绍
复制id: 1 select_type: SIMPLE table: account type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 1 filtered: 100.00 Extra: 1 row in set,语句 1 warning (0.00 sec) 1.2.3.4.5.6.7.8.9.10.11.12.
复制id: 1 select_type: SIMPLE table: account type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 1 filtered: 100.00 Extra: 1 row in set,语句 1 warning (0.00 sec) 1.2.3.4.5.6.7.8.9.10.11.12.