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check约束好像不起作用啊？！
情况如下：
mysql> create table t (c1 integer check (c1 < 50));
Query OK, 0 rows affected (0.03 sec)
mysql> insert into t values(20);
Query OK, 1 row affected (0.00 sec)
mysql> insert into t values(60);
Query OK, 1 row affected (0.00 sec)
mysql> select * from t;
+----- ...