cte在与临时表和拆分字符串的sql服务器

Question

我有两个colums ID和权利的表。 Rights列将保留250个固定字符，如'010111100000000 .... 250次'。现在，我必须拆分权限列字符串，并将结果存储在临时表中，其结构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，我将得到5 * 250 = 1250行。

我已经拆分了单个字符串并使用了游标，但现在我想避免游标。我如何才能做到这一点。

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

这是怎么回事？

的理念是：获得250运行号的列表，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 

如果你想写到一个临时表这一点，只是--之前INTO删除