[英]cte in sql server with temp table and split string
我有兩個列ID和權限的表。 權限列將以0,1格式(例如“ 010111100000000 .... 250次”)保留250個固定字符。 現在,我必須拆分權限列字符串,並在臨時表中獲取結果,該表將具有結構ID,權限(0或1),位置(1至250)。 假設我最初有5行,那么在臨時表中我將獲得5 * 250 = 1250行。
我已經分割了單個字符串並使用了光標,但是現在我想避免使用光標。 我如何實現這一目標。
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);
那這個呢?
這個想法是:獲取250個連續數字的列表,並使用SUBSTRING
從每個位置讀取一個字符:
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
如果要將其寫入臨時表,只需在INTO
之前刪除--
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