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MySQL查询根据另一个字段中的布尔值仅获取单个字段

2024-04-22 16:36:03 471

让我们首先创建一个表-

mysql> create table DemoTable
(
   EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   EmployeeName varchar(40),
   isMarried boolean
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(EmployeeName,isMarried) values('Chris',true);
mysql> insert into DemoTable(EmployeeName,isMarried) values('Robert',false);
mysql> insert into DemoTable(EmployeeName,isMarried) values('Mike',false);
mysql> insert into DemoTable(EmployeeName,isMarried) values('Bob',true);
mysql> insert into DemoTable(EmployeeName,isMarried) values('Tom',true);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+------------+--------------+-----------+
| EmployeeId | EmployeeName | isMarried |
+------------+--------------+-----------+
|          1 | Chris        |         1 |
|          2 | Robert       |         0 |
|          3 | Mike         |         0 |
|          4 | Bob          |         1 |
|          5 | Tom          |         1 |
+------------+--------------+-----------+
5 rows in set (0.00 sec)

以下是根据另一个字段中的布尔值仅获取单个字段的查询-

mysql> select EmployeeName from DemoTable where isMarried=true;

这将产生以下输出-

+--------------+
| EmployeeName |
+--------------+
| Chris        |
| Bob          |
| Tom          |
+--------------+
3 rows in set (0.00 sec)

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MySQL查询根据另一个字段中的布尔值仅获取单个字段

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