mysql> select upper(" cdcdcd");+------------------+| upper(" cdcdcd") |+------------------+| CDCDCD |+------------------+1 row in set (0.00 sec)
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mysql> select upper(" cdcdcd");+------------------+| upper(" cdcdcd") |+------------------+| CDCDCD |+------------------+1 row in set (0.00 sec)
转载于:https://www.cnblogs.com/sea-stream/p/11308210.html