Question

我正在尝试创建一个SQL脚本来循环遍历一个表，并检查AppID字段是否在另一个表中正确。然后，如果它在另一个表中找到记录，则会删除该行，并设置是否删除该变量。

到目前为止，我已经创建了循环，并在找到记录时设置了变量，但是我尝试添加delete语句，并且产生了一个错误，提示“ ELSE附近的语法不正确”错误消息

Use APTLive
Go

declare @RowNum int, @CustId nchar(5), @Name1 nchar(25)
declare @ProdCount int
declare @PROD nchar(5)
select @CustId=MAX(ID) FROM TempAppTable     --start with the highest ID
Select @RowNum = Count(*) From TempAppTable      --get total number of records
WHILE @RowNum > 0                          --loop until no more records
BEGIN   
select @Name1 = AppID from TempAppTable where ID = @CustID    --get other info from that row
select @ProdCount = Count(*) from ProductType where AppRefID = @Name1    --GET APP COUNT ProductType

print cast(@RowNum as char(12)) + ' ' + @Name1 + ' ' + cast(@ProdCount as char(3)) 

If @ProdCount    > 0    SET @PROD = 'Y'  DELETE FROM ProductType    WHERE AppRefID = @Name1     ELSE SET @PROD = 'N'


select top 1 @CustId=ID from TempAppTable where ID < @CustID order by ID desc
    set @RowNum = @RowNum - 1
END

谁能让我知道为什么我收到此错误？是因为IF仅在返回true或false时才可以执行一项任务吗？

Answer 1

由于您的BEGIN条件，您错过了END和IF，因为您的IF包含多个指令，因此您需要在代码块中使用BEGIN＆END

Use APTLive
Go

declare @RowNum int, @CustId nchar(5), @Name1 nchar(25)
declare @ProdCount int
declare @PROD nchar(5)
select @CustId=MAX(ID) FROM TempAppTable     --start with the highest ID
Select @RowNum = Count(*) From TempAppTable      --get total number of records
WHILE @RowNum > 0                          --loop until no more records
BEGIN   
select @Name1 = AppID from TempAppTable where ID = @CustID    --get other info from that row
select @ProdCount = Count(*) from ProductType where AppRefID = @Name1    --GET APP COUNT ProductType

print cast(@RowNum as char(12)) + ' ' + @Name1 + ' ' + cast(@ProdCount as char(3)) 

If @ProdCount    > 0    
BEGIN   -- [Added Mjoy]
   SET @PROD = 'Y'   
   DELETE FROM ProductType    WHERE AppRefID = @Name1     
END     -- [Added Mjoy]
ELSE SET @PROD = 'N'


select top 1 @CustId=ID from TempAppTable where ID < @CustID order by ID desc
    set @RowNum = @RowNum - 1
END

错误遍历表并删除行

1 个答案: