一位的最小数据类型可以是bit(1)。语法如下 -
yourColumnName bit(1)为了理解上述语法，让我们创建一个表。创建表的查询如下 -
mysql> create table bitDemo
-> (
-> isValid bit(1)
-> );
Query OK, 0 rows affected (0.49 sec)现在您可以借助 SHOW CREATE 命令检查表的所有详细信息。查询如下 -
mysql> show create table bitDemo;这是输出 -
+---------+-----------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+---------+-----------------------------------------------------------------------------------------------------------------------------+
| bitDemo | CREATE TABLE `bitdemo` (`isValid` bit(1) DEFAULT NULL) ENGINE =InnoDB DEFAULT CHARSET =utf8mb4 COLLATE =utf8mb4_0900_ai_ci |
+---------+-----------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)使用插入命令在表中插入一些记录。查询如下 -
mysql> insert into bitDemo values(0);
Query OK, 1 row affected (0.13 sec)
mysql> insert into bitDemo values(1);
Query OK, 1 row affected (0.10 sec)
mysql> insert into bitDemo values(1);
Query OK, 1 row affected (0.07 sec)
mysql> insert into bitDemo values(0);
Query OK, 1 row affected (0.14 sec)使用 select 语句显示表中的所有记录。查询如下 -
mysql> select *from bitDemo;这是输出 -
+---------+
| isValid |
+---------+
| |
| |
| |
| |
+---------+
4 rows in set (0.00 sec)要显示位值，请使用以下查询 -
mysql> select isValid+0 from bitDemo;以下是输出 -
+-----------+
| isValid+0 |
+-----------+
| 0 |
| 1 |
| 1 |
| 0 |
+-----------+
4 rows in set (0.00 sec)
