Question

首次在SQL中使用WHILE函数。我已经浏览了很多帖子，试图找出我做错了什么，但是还没有发现。

DECLARE @BeginTagNo INT
        SELECT @BeginTagNo = (SELECT MIN(BEGINTAGNO) FROM dbo.INLoadTagReconciliation WHERE BEGINTAGNO <> 0 AND TYPE = 1 AND TRACTCODE = '00099-023-F')
DECLARE @EndTagNo INT
        SELECT @EndTagNo = (SELECT MAX(ENDTAGNO) FROM dbo.INLoadTagReconciliation WHERE ENDTAGNO <> 0 AND TYPE = 1 AND TRACTCODE = '00099-023-F')
DECLARE @id INT
        SELECT @BeginTagNo = (SELECT MIN(BEGINTAGNO) FROM dbo.INLoadTagReconciliation WHERE BEGINTAGNO <> 0 AND TYPE = 1 AND TRACTCODE = '00099-023-F')     

WHILE @id >= @BeginTagNo and @id <= @EndTagNo

BEGIN
    insert INTO workINLoadTagReconciliation values(@id,null,null)
    select @id = @id+1
END

当我运行上述命令时，表中什么都没有输入。运行此命令时：

SELECT @BeginTagNo = (SELECT MIN(BEGINTAGNO) FROM dbo.INLoadTagReconciliation WHERE BEGINTAGNO <> 0 AND TYPE = 1 AND TRACTCODE = '00099-023-F')

您将返回2021901。

运行此命令时：

SELECT @EndTagNo = (SELECT MAX(ENDTAGNO) FROM dbo.INLoadTagReconciliation WHERE ENDTAGNO <> 0 AND TYPE = 1 AND TRACTCODE = '00099-023-F')

您将返回2022600。@id变量与@BeginTagNo相同。我希望从中生成一张表，该表具有从2021901到2022600的699行。有人能说明我的愚蠢之处吗？

Answer 1

忘记循环。试试；

INSERT INTO workINLoadTagReconciliation 
SELECT BEGINTAGNO, NULL, NULL
FROM dbo.INLoadTagReconciliation
WHERE BEGINTAGNO >= 
    (SELECT MIN(BEGINTAGNO) FROM dbo.INLoadTagReconciliation 
      WHERE BEGINTAGNO <> 0 AND TYPE = 1 AND TRACTCODE = '00099-023-F')
AND BEGINTAGNO <= 
    (SELECT MAX(ENDTAGNO) FROM dbo.INLoadTagReconciliation 
      WHERE ENDTAGNO <> 0 AND TYPE = 1 AND TRACTCODE = '00099-023-F')

没有记录插入使用WHILE函数来生成多个新记录

1 个答案: