Question

我想在新行的表列中字符串为表

abc
def
ghi
jkl

Answer 1

如果您使用SQL SERVER 2016，请使用STRING_SPLIT功能

SELECT *
FROM   String_split('abc,def,ghi,jkl', ',')

如果你使用的是SQL SREVER 2016以下的任何东西，那么这里是最好的分割字符串函数。参考here

CREATE FUNCTION [dbo].[Delimitedsplit8k] (@pString    VARCHAR(8000),
                                          @pDelimiter CHAR(1))
RETURNS TABLE
WITH SCHEMABINDING
AS
    RETURN 
--===== "Inline" CTE Driven "Tally Table" produces values from 0 up to 10,000...
     -- enough to cover NVARCHAR(4000)
  WITH E1(N) AS (
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
                ),                          --10E+1 or 10 rows
       E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
       E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max
 cteTally(N) AS (--==== This provides the "base" CTE and limits the number of rows right up front
                     -- for both a performance gain and prevention of accidental "overruns"
                 SELECT TOP (ISNULL(DATALENGTH(@pString),0)) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
                ),
cteStart(N1) AS (--==== This returns N+1 (starting position of each "element" just once for each delimiter)
                 SELECT 1 UNION ALL
                 SELECT t.N+1 FROM cteTally t WHERE SUBSTRING(@pString,t.N,1) = @pDelimiter
                ),
cteLen(N1,L1) AS(--==== Return start and length (for use in substring)
                 SELECT s.N1,
                        ISNULL(NULLIF(CHARINDEX(@pDelimiter,@pString,s.N1),0)-s.N1,8000)
                   FROM cteStart s
                )
--===== Do the actual split. The ISNULL/NULLIF combo handles the length for the final element when no delimiter is found.
 SELECT ItemNumber = ROW_NUMBER() OVER(ORDER BY l.N1),
        Item       = SUBSTRING(@pString, l.N1, l.L1)
   FROM cteLen l
;

GO

调用函数

SELECT *
FROM   dbo.DelimitedSplit8K('abc,def,ghi,jkl', ',')

Answer 2

您可以使用递归CTE分割字符串。它允许您跟踪字符串中字符串的位置（如果需要），并提供返回主表中ID / Key值的链接。（这使您可以避免使用功能，如果它不是一个选项）

data work.calendrier;
set projet.calendrier;
*do i=1 to 3;
if date= "&vv1"D then savinglight = 1;
*end;
run;

我有字符串＆＃39; abc，def，ghi，jkl＆＃39;

2 个答案: