如何在MySQL表中选择特定范围内的值？

为了在MySQL表中选择特定范围内的值，您可以使用WHERE子句。让我们先创建一个表：

mysql> create table DemoTable
(
CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
CustomerName varchar(200),
CustomerAge int,
isRegularCustomer bool
);
Query OK, 0 rows affected (0.57 sec)

以下是使用insert命令向表中插入一些记录的查询：

mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Chris',24,true);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Robert',26,false);
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Mike',27,false);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Larry',22,true);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Sam',30,true);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Carol',26,true);
Query OK, 1 row affected (0.16 sec)

以下是使用select命令从表中显示记录的查询：

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。在此，我们选择年龄大于等于24岁且小于等于27岁的客户记录。此外，客户应为常规客户，即在“isRegularCustomer”列下具有1个值：

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)

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