这个语句怎么写呢？
表结构如下
id value class
1 3,2,4,5 no
2 5,1,1+2 yes
将value列按逗号拆分后加一列code为排序，结果如下
id value class code
1 3 no 1
1 2 no 2
1 4 no 3
1 5 no 4
2 5 yes 1
2 1 yes 2
2 1+2 yes 3
[解决办法]
create table TB_1 (ID INT ,VALUE VARCHAR(10),CLASS VARCHAR(10))
GO
INSERT INTO TB_1 VALUES (1,'3,2,4,5,','NO')
GO
INSERT INTO TB_1 VALUES (2,'5,1,1+2,','YES')
GO
SELECT * FROM TB_1
WITH TB_2 AS (
SELECT ID,VALUE ,CLASS,CHARINDEX(',',VALUE) STA,CHARINDEX(',',VALUE)-1 LENS FROM TB_1
UNION ALL
SELECT ID,VALUE ,CLASS,CHARINDEX(',',VALUE,STA+1) STA,CHARINDEX(',',VALUE,STA+1)-STA-1 LENS FROM TB_2 WHERE STA<>0)
--SELECT * FROM TB_2
SELECT ID,SUBSTRING(VALUE,STA-LENS,LENS),class FROM TB_2
WHERE STA<>0
--创建表结构
IF(OBJECT_ID('TA') IS NOT NULL) DROP TABLE TA
CREATE TABLE TA(id INT,[value] VARCHAR(100), class VARCHAR(10))
INSERT INTO TA(id,[value],class)
SELECT 1,'3,2,4,5','no' UNION ALL
SELECT 2,'5,1,1+2','yes'
--查询结果
SELECT T.id
,SUBSTRING(T.[value],R.number,CHARINDEX(',',T.[value]+',',R.number)-R.number) AS value
,T.class
,ROW_NUMBER() OVER (PARTITION BY T.id ORDER BY T.id) AS code
FROM TA AS T
JOIN (
SELECT TOP 10 number FROM [master].dbo.spt_values
WHERE [type]='P' ORDER BY number)AS R ON (CHARINDEX(',',','+T.[value],R.number)=R.number)
--运行结果
id value class code
----------- ---------------------------- ---------- --------------------
1 3 no 1
1 2 no 2
1 4 no 3
1 5 no 4
2 5 yes 1
2 1 yes 2
2 1+2 yes 3
(7 行受影响)
