使用“with”创建函数的问题答案

【问题标题】：Issue creating function with a "with"使用“with”创建函数的问题
【发布时间】：2015-07-05 12:37:23
【问题描述】：

我正在尝试创建这个函数（变量名称已更改，因此允许命名错误，因为在没有函数的情况下测试原始文件可以正常工作），

 CREATE FUNCTION [dbo].[GetQuality](@FruitID VARCHAR(200))
RETURNS varchar(200)
AS
BEGIN
DECLARE @Result varchar(200)

SET @Result = (

WITH 
latest AS
(
    SELECT * FROM (SELECT TOP 1 * FROM Fruits_Crate WHERE FruitID like @FruitID ORDER BY ExpiryDate DESC) a
), 
result AS
(
    SELECT 
        latest.ExpiryDate as LatestExpiryDate, latest.Size as LatestSize, latest.Weight as LatestWeight,
        previous.ExpiryDate as PreviousExpiryDate, previous.Size as PreviousSize, previous.Weight as PreviousWeight,
        CASE SIGN((latest.Weight * latest.Size) - (previous.Weight * previous.Size))
            WHEN 1 THEN 'Increased'
            WHEN 0 THEN 'Static'
            WHEN -1 THEN 'Decreased'
            ELSE 'No Previous Data'
        END AS Movement 
    FROM (SELECT TOP 1 * FROM (SELECT TOP 2 * FROM Fruits_Crate WHERE FruitID like @FruitID ORDER BY ExpiryDate DESC) x  ORDER BY ExpiryDate) previous
    FULL OUTER JOIN latest ON previous.FruitID = latest.FruitID
)

SELECT result.Movement AS FruitMovement from result;
)

RETURN @Result

END

错误

消息 156，级别 15，状态 1，过程 GetQuality，第 10 行关键字“WITH”附近的语法不正确。

消息 319，级别 15，状态 1，过程 GetQuality，第 10 行关键字“with”附近的语法不正确。如果这个语句是一个公用表表达式、一个 xmlnamespaces 子句或一个更改跟踪上下文子句，则前面的语句必须以分号结束。

消息 102，级别 15，状态 1，过程 GetQuality，第 14 行 ',' 附近的语法不正确。消息 102，级别 15，状态 1，过程 GetQuality，第 31 行 ')' 附近的语法不正确。

【问题讨论】：

标签： sql-server sql-server-2008 function

【解决方案1】：

我想你可以把赋值往下移，在 with 前加一个分号，一切都会好起来的。

CREATE FUNCTION [dbo].[GetQuality](@FruitID VARCHAR(200))
RETURNS varchar(200)
AS
BEGIN
DECLARE @Result varchar(200);

WITH 
latest AS
(
    SELECT * FROM (SELECT TOP 1 * FROM Fruits_Crate WHERE FruitID like @FruitID ORDER BY ExpiryDate DESC) a
), 
result AS
(
    SELECT 
        latest.ExpiryDate as LatestExpiryDate, latest.Size as LatestSize, latest.Weight as LatestWeight,
        previous.ExpiryDate as PreviousExpiryDate, previous.Size as PreviousSize, previous.Weight as PreviousWeight,
        CASE SIGN((latest.Weight * latest.Size) - (previous.Weight * previous.Size))
            WHEN 1 THEN 'Increased'
            WHEN 0 THEN 'Static'
            WHEN -1 THEN 'Decreased'
            ELSE 'No Previous Data'
        END AS Movement 
    FROM (SELECT TOP 1 * FROM (SELECT TOP 2 * FROM Fruits_Crate WHERE FruitID like @FruitID ORDER BY ExpiryDate DESC) x  ORDER BY ExpiryDate) previous
    FULL OUTER JOIN latest ON previous.FruitID = latest.FruitID
)

SELECT @RESULT = result.Movement AS FruitMovement from result;


RETURN @Result

END

【讨论】：