Split string via select statement

问题

Fairly simple question, but seems impossibe to get an answer.

If I have this:

declare @Agent nvarchar(4000) = '2131235,334225';

Is there a select statement I can write to split the string where the coma is, WITHOUT having to write a function?

Something like:

SELECT SOME_SPLIT_LOGIC(@Agent)

I would like it to return:

Column
--------
2131235
334225

Please note I am use MS-SQL 2012

回答1:

DECLARE @LeftPart TABLE
(Agent int
)

DECLARE @RightPart TABLE
(Agent1 int
)

declare @Agent nvarchar(4000) = '2131235,334225';

INSERT INTO @LeftPart
SELECT LEFT(@Agent,7)

INSERT INTO @RightPart
SELECT RIGHT(@Agent,6)

SELECT * INTO #Temp
FROM 
(
SELECT * FROM @LeftPart
UNION ALL
SELECT * FROM @RightPart
)A

SELECT * FROM #Temp

回答2:

How about:

DECLARE @Agent VARCHAR(4000) = '2131235,334225'
DECLARE @Delimiter VARCHAR(1) = ','

;WITH CTE
AS
(
    SELECT 1 AS ID 
    UNION ALL
    SELECT ID + 1 FROM CTE
    WHERE ID < 4000
)   

SELECT
    SUBSTRING(@Agent, t.ID, CHARINDEX(@Delimiter, @Agent + @Delimiter, t.ID) - t.ID) AS Agent
FROM CTE t
WHERE t.ID <= DATALENGTH(@Agent)+1
    AND SUBSTRING(@Delimiter + @Agent, t.ID, 1) = @Delimiter
OPTION (MAXRECURSION 4000)

More information can be found here: http://www.sqlservercentral.com/articles/Tally+Table/72993/

来源：https://stackoverflow.com/questions/45991269/split-string-via-select-statement