mysql创建计算列（5.7以后才有） mysql创建计算列

 

mysql> create table t(id int auto_increment not null,c1 int,c2 int,c3 int as (c1+c2),primary key(id));

Query OK, 0 rows affected (0.41 sec)

mysql> create table t(id int auto_increment not null,c1 int,c2 int,c3 int as (c1+c2),primary key(id));

Query OK, 0 rows affected (0.41 sec)