下列mysql查询是等价的：
mysql>mysql>mysql> select version();+---------------------+| version() |+---------------------+| 5.0.41-community-nt |+---------------------+1 row in set (0.00 sec)mysql> select version();+---------------------+| version() |+---------------------+| 5.0.41-community-nt |+---------------------+1 row in set (0.00 sec)mysql> select version();+---------------------+| version() |+---------------------+| 5.0.41-community-nt |+---------------------+1 row in set (0.00 sec)mysql>