mysql_2

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mysql> alter table member add constraint score check(score>=0 and score<=100);
Query OK, 0 rows affected (0.04 sec)
Records: 0  Duplicates: 0  Warnings: 0
限定字段取值范围

mysql> alter table member add sex enum(‘1‘,‘2‘) not null;

mysql> alter table member add constraint score check(score>=0 and score<=100);
Query OK, 0 rows affected (0.04 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql_2

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原文地址：http://www.cnblogs.com/guxuanqing/p/4945689.html