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)
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