mysql> select right(" dedede",6); +---------------------+ | right(" dedede",6) | +---------------------+ | dedede | +---------------------+ 1 row in set (0.00 sec) mysql> select right(" dedede",3); +---------------------+ | right(" dedede",3) | +---------------------+ | ede | +---------------------+ 1 row in set (0.00 sec)
原文：https://www.cnblogs.com/sea-stream/p/11308206.html