时间:2021-07-01 10:21:17 帮助过:387人阅读
参考 https://blog.csdn.net/BockSong/article/details/80933477
alter table TABNAME drop primary key;
alter table TABNAME add primary key(another_col,...);
alter table TABNAME
modify field1 varchar(30) default NULL;
mysql修改联合主键
标签:varchar 主键 primary art 联合主键 lte col key tab