如何在MySQL表中选择特定值范围？

为了在MySQL表中选择特定范围的值，可以使用WHERE子句。让我们首先创建一个表：

mysql> create table DemoTable
(
   CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   CustomerName varchar(200),
   CustomerAge int,
   isRegularCustomer bool
);

以下是使用insert命令在表中插入一些记录的查询：

mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Chris',24,true);
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Robert',26,false);
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Mike',27,false);
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Larry',22,true);
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Sam',30,true);
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Carol',26,true);

以下是使用select命令显示表中记录的查询：

mysql> select *from DemoTable;

这将产生以下输出：

+------------+--------------+-------------+-------------------+
| CustomerId | CustomerName | CustomerAge | isRegularCustomer |
+------------+--------------+-------------+-------------------+
|          1 | Chris        |          24 |                 1 |
|          2 | Robert       |          26 |                 0 |
|          3 | Mike         |          27 |                 0 |
|          4 | Larry        |          22 |                 1 |
|          5 | Sam          |          30 |                 1 |
|          6 | Carol        |          26 |                 1 |
+------------+--------------+-------------+-------------------+
6 rows in set (0.00 sec)

以下是在MySQL表中选择特定值范围的查询。在这里，我们选择年龄大于等于24且小于等于27的客户记录。此外，客户应为常规客户，即“ isRegularCustomer”列下的值为1：

mysql> select CustomerId,CustomerName,CustomerAge,isRegularCustomer from DemoTable
where isRegularCustomer=true AND CustomerAge >=24 AND CustomerAge <= 27;

这将产生以下输出

+------------+--------------+-------------+-------------------+
| CustomerId | CustomerName | CustomerAge | isRegularCustomer |
+------------+--------------+-------------+-------------------+
|          1 | Chris        |          24 |                 1 |
|          6 | Carol        |          26 |                 1 |
+------------+--------------+-------------+-------------------+
2 rows in set (0.00 sec)