Question

具体来说，我正在尝试创建变量，然后填充它们。

到目前为止我的源代码......

USE [AdventureWorks2012]

DECLARE @HighBonusAMT money, @LowBonusAMTnotzero money;
DECLARE @NumberofSalespeopleBonusZero INT, @NumberofSalespeopleGreaterthan4 INT, @NumberofSalespeopleGreaterthanzerolessthanorequalto4 INT;
SET @HighBonusAMT = (SELECT MAX(Bonus) FROM Sales.SalesPerson);
SET @LowBonusAMTnotzero = (SELECT MIN(Bonus) FROM Sales.SalesPerson WHERE Bonus <> $0);
SET @NumberofSalespeopleBonusZero = (SELECT BusinessEntityID FROM Sales.SalesPerson WHERE Bonus = $0);
SET @NumberofSalespeopleGreaterthan4 = (SELECT BusinessEntityID FROM Sales.SalesPerson WHERE Bonus > 4000);
SET @NumberofSalespeopleGreaterthanzerolessthanorequalto4 = (SELECT BusinessEntityID FROM Sales.SalesPerson WHERE Bonus > 0 AND Bonus <= 4000);

我的源代码自述文件......

创建变量，然后填充它们以存储：

最高奖金额
最低奖金额不是0
奖金为0
有奖金的销售人员数量＆gt; $ 4000
有奖金的销售人员数量＆gt; 4000美元有奖金的销售人员＆gt; $ 4000

当我收到错误消息时，我做错了什么：

Msg 512, Level 16, State 1, Line 20
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
Msg 512, Level 16, State 1, Line 21
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
Msg 512, Level 16, State 1, Line 22
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

Answer 1

在以下情况下，您尝试为整数变量分配多个值：

SET @NumberofSalespeopleBonusZero = (SELECT BusinessEntityID, Bonus FROM Sales.SalesPerson WHERE Bonus = $0);
SET @NumberofSalespeopleGreaterthan4 = (SELECT BusinessEntityID, Bonus FROM Sales.SalesPerson WHERE Bonus > 4000);
SET @NumberofSalespeopleGreaterthanzerolessthanorequalto4 = (SELECT BusinessEntityID, Bonus FROM Sales.SalesPerson WHERE Bonus > 0 AND Bonus <= 4000);

您只能为这些变量分配一个值（原子）。

变量@NumberofSalespeopleBonusZero，NumberofSalespeopleGreaterthan4，@NumberofSalespeopleGreaterthanzerolessthanorequalto4是整数类型，这意味着它们只能被赋予一个整数值，即10或251或1001等值。

以下查询输出两个结果：

SELECT BusinessEntityID, Bonus FROM Sales.SalesPerson WHERE Bonus = $0

BusinessEntityID
加成

变量不能同时包含这两个值。如果您需要这两个值，则可以定义两个变量来保存每列的值。

编辑：我不知道您的确切要求，所以从业务这可能并不理想。但要给你一个摆脱的想法您可以尝试以下SQL Server错误消息：

USE [AdventureWorks2012]
DECLARE @HighBonusAMT money, @LowBonusAMTnotzero money
DECLARE @NumberofSalespeopleBonusZero INT
DECLARE @NumberofSalespeopleGreaterthan4 INT
DECLARE @NumberofSalespeopleGreaterthanzerolessthanorequalto4 INT

DECLARE @NumberofSalespeopleBonusZeroID INT
DECLARE @NumberofSalespeopleGreaterthan4ID INT
DECLARE @NumberofSalespeopleGreaterthanzerolessthanorequalto4ID INT


SET @HighBonusAMT = (SELECT MAX(Bonus) FROM Sales.SalesPerson);
SET @LowBonusAMTnotzero = (SELECT MIN(Bonus) FROM Sales.SalesPerson WHERE Bonus <> $0);

SET @NumberofSalespeopleBonusZero = SELECT TOP 1 Bonus FROM Sales.SalesPerson WHERE Bonus = $0
SET @NumberofSalespeopleGreaterthan4 = SELECT TOP 1 Bonus FROM Sales.SalesPerson WHERE Bonus > 4000
SET @NumberofSalespeopleGreaterthanzerolessthanorequalto4 = SELECT TOP 1 Bonus FROM Sales.SalesPerson WHERE Bonus > 0 AND Bonus <= 4000


SET @NumberofSalespeopleBonusZeroID = SELECT TOP 1 BusinessEntityID Sales.SalesPerson WHERE Bonus = $0
SET @NumberofSalespeopleGreaterthan4ID = SELECT TOP 1 BusinessEntityID FROM Sales.SalesPerson WHERE Bonus > 4000
SET @NumberofSalespeopleGreaterthanzerolessthanorequalto4ID = SELECT TOP 1 BusinessEntityID FROM Sales.SalesPerson WHERE Bonus > 0 AND Bonus <= 4000

希望这有帮助!!!

Answer 2

您是否尝试将整数存储到最后三个SELECT？

添加COUNT：

SET @NumberofSalespeopleBonusZero = (SELECT COUNT(*) FROM Sales.SalesPerson WHERE Bonus = $0);

......等等。

Answer 3

如果我没有注意到，你需要最后3个变量中的销售人员数量。

你可以这样做：

USE [AdventureWorks2012]

DECLARE @HighBonusAMT money, @LowBonusAMTnotzero money;
DECLARE @NumberofSalespeopleBonusZero INT, @NumberofSalespeopleGreaterthan4 INT, @NumberofSalespeopleGreaterthanzerolessthanorequalto4 INT;
SET @HighBonusAMT = (   SELECT MAX(Bonus) 
                        FROM Sales.SalesPerson )
SET @LowBonusAMTnotzero = (  SELECT MIN(Bonus) 
                             FROM Sales.SalesPerson 
                             WHERE Bonus <> $0  )
SET @NumberofSalespeopleBonusZero = (  SELECT COUNT(*) 
                                       FROM Sales.SalesPerson 
                                       WHERE Bonus = $0 
                                       GROUP BY BusinessEntityID  )
SET @NumberofSalespeopleGreaterthan4 = (  SELECT COUNT(*) 
                                          FROM Sales.SalesPerson 
                                          WHERE Bonus > 4000 
                                          GROUP BY BusinessEntityID  )
SET @NumberofSalespeopleGreaterthanzerolessthanorequalto4 = (  SELECT COUNT(*) 
                                                               FROM Sales.SalesPerson 
                                                               WHERE Bonus > 0 AND Bonus <= 4000 
                                                               GROUP BY BusinessEntityID  )

Answer 4

您还可以使用聚合函数在聚合中使用CASE子句在一个语句中填充多个变量，例如：

USE [AdventureWorks2012]

DECLARE @HighBonusAMT money, @LowBonusAMTnotzero money;
DECLARE @NumberofSalespeopleBonusZero INT, @NumberofSalespeopleGreaterthan4 INT, @NumberofSalespeopleGreaterthanzerolessthanorequalto4 INT;


SELECT
    @HighBonusAMT = MAX(Bonus)
    ,@LowBonusAMTnotzero = MIN(CASE WHEN Bonus > 0 THEN Bonus END)
    ,@NumberofSalespeopleBonusZero = COUNT(CASE WHEN Bonus = 0 THEN Bonus END)
    ,@NumberofSalespeopleGreaterthan4 = COUNT(CASE WHEN Bonus > 4000 THEN Bonus END)
    ,@NumberofSalespeopleGreaterthanzerolessthanorequalto4 = COUNT(CASE WHEN Bonus BETWEEN 0 AND 4000 THEN Bonus END)
FROM
    Sales.SalesPerson

Answer 5

对变量赋值后，会给出错误，因为在使用标量变量时，只能为变量赋值。您正在使用的子查询返回多个值。如果您要查找符合筛选条件的计数，请使用适当的函数并按需分组。如果您按businessentityid进行分组，并且如果您有多个businessentityid，则有可能获得表结果集（这意味着返回多行）。如果要计算与使用的过滤器匹配的每个businessentityId，则可以将变量声明为表变量而不是标量变量。希望这有用!!

SET @NumberofSalespeopleBonusZero =（SELECT BusinessEntityID FROM Sales.SalesPerson WHERE Bonus = $ 0）; SET @ NumberofSalespeopleGreaterthan4 =（选择BusinessEntityID FROM Sales.SalesPerson WHERE Bonus＆gt; 4000）; SET @ NumberofSalespeopleGreaterthanzerolessthanorequalto4 =（选择BusinessEntityID FROM Sales.SalesPerson WHERE Bonus＆gt; 0 AND Bonus＆lt; = 4000）;

在SQL Server 2012家庭作业分配中创建变量时遇到问题？

5 个答案: