Question

我有两个colums ID和权限的表。权利栏将在0,1形式中保留250个固定字符，如'010111100000000 .... 250次'。现在我必须拆分权限列字符串并在临时表中获得结果，该表将具有结构ID，权限（0或1），位置（1到250）。假设我最初有5行，然后在临时表中我会得到5 * 250 = 1250行。

我已拆分单个字符串并使用了光标，但现在我想避开光标。我怎么能做到这一点。

declare  @temp table(Chars int not null, RowID int not null)

    --Split the rights string into 250 char rows with RowID as each position
    ;with cte as
    (
        select substring(@rights, 1, 1) as Chars,
                stuff(@rights, 1, 1, '') as rights,
                1 as RowID
        union all
        select substring(rights, 1, 1) as Chars,
                stuff(rights, 1, 1, '') as rights,
                RowID + 1 as RowID
        from cte
        where len(rights) > 0

    )

    --Get the values in a temporary table except 0
    insert into @temp select Chars, RowID from cte  option (MAXRECURSION 300);

Answer 1

这个怎么样？

这个想法是：获取250个正在运行的数字的列表，并使用SUBSTRING从每个位置读取一个字符：

DECLARE @tbl TABLE (ID INT IDENTITY,Rights VARCHAR(250));
INSERT INTO @tbl VALUES
 ('1011101110000101010111000...'), ('0100010111100010101...');

WITH Nr250 AS
(SELECT TOP 250 ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) AS Nr FROM master.dbo.spt_values)

SELECT t.ID 
      ,t.Rights
      ,Nr AS Position
      ,SUBSTRING(t.Rights,Nr,1) AS PosDigit
--INTO #SomeTempTable
FROM Nr250
CROSS JOIN @tbl AS t

如果您想将此内容写入临时表，只需删除--之前的INTO

在具有临时表和拆分字符串的sql server中cte

1 个答案: