Mysql 将值存储在SQL中的不同变量中，以（逗号）“，”分隔

我需要分离值并将它们存储在SQL中的不同变量中

比如说

a='3100,3101,3102,....'

输出应该是

x=3100
y=3101
z=3102
.
.
.

---

我建议您使用以下查询，它比交叉应用和udf等其他函数快得多

SELECT 
    Variables
    ,S_DATA
FROM    (
    SELECT
            Variables
            ,CASE   WHEN LEN(LIST2)>0 THEN LTRIM(RTRIM(SUBSTRING(LIST2, NUMBER+1, CHARINDEX(',', LIST2, NUMBER+1)-NUMBER - 1)))
                    ELSE NULL
            END AS S_DATA 
           ,NUMBER
    FROM(
        SELECT  Variables
                ,','+COMMA_SEPARETED_COLUMN+',' LIST2
                FROM Tb1
        )DT 
         LEFT OUTER JOIN TB N ON (N.NUMBER < LEN(DT.LIST2)) OR (N.NUMBER=1 AND DT.LIST2 IS NULL)
        WHERE SUBSTRING(LIST2, NUMBER, 1) = ',' OR LIST2 IS NULL
     ) DT2
     WHERE S_DATA<>''

在运行上述查询之前，还应该创建一个表“NUMBER”

CREATE TABLE TB (Number INT)
 DECLARE @I INT=0
 WHILE @I<1000
 BEGIN
 INSERT INTO TB VALUES (@I)
 SET @I=@I+1
 END 

---

解析TVF的结果可以很容易地合并到联接或IN中

Declare @a varchar(max)='3100,3101,3102'
Select * from [dbo].[udf-Str-Parse](@a,',')

返回

RetSeq  RetVal
1       3100
2       3101
3       3102

UDF（如果需要）比递归、循环和xml快得多

CREATE FUNCTION [dbo].[udf-Str-Parse] (@String varchar(max),@Delimiter varchar(25))
Returns Table 
As
Return (  
    with   cte1(N)   As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
           cte2(N)   As (Select Top (IsNull(DataLength(@String),0)) Row_Number() over (Order By (Select NULL)) From (Select N=1 From cte1 a,cte1 b,cte1 c,cte1 d) A ),
           cte3(N)   As (Select 1 Union All Select t.N+DataLength(@Delimiter) From cte2 t Where Substring(@String,t.N,DataLength(@Delimiter)) = @Delimiter),
           cte4(N,L) As (Select S.N,IsNull(NullIf(CharIndex(@Delimiter,@String,s.N),0)-S.N,8000) From cte3 S)

    Select RetSeq = Row_Number() over (Order By A.N)
          ,RetVal = LTrim(RTrim(Substring(@String, A.N, A.L)))
    From   cte4 A
);
--Orginal Source http://www.sqlservercentral.com/articles/Tally+Table/72993/
--Much faster than str-Parse, but limited to 8K
--Select * from [dbo].[udf-Str-Parse-8K]('Dog,Cat,House,Car',',')
--Select * from [dbo].[udf-Str-Parse-8K]('John||Cappelletti||was||here','||')

---

在x，y，z之后应该是什么？我只需要单独存储它们，然后使用它们从不同的表中提取关联数据。如果有3个以上的值要分离怎么办？是的，它将支持u可以传递多个值作为输入。@vaibhavsinhao再查询一次，现在我有两个变量a='31013110'和b='3101-3110。如何使用if-else条件或may-be-case条件区分它们？3101可以是311001任何长度，它是动态的@chanukya@VaibhavSinhab有3101到3110或3101-3110有3101到3110…这是一个范围..但它只会像这样输入--“3101-3110”…我只需要区分用户输入的内容..然后应用if-else条件..@chanukya

CREATE FUNCTION [dbo].[udf-Str-Parse] (@String varchar(max),@Delimiter varchar(25))
Returns Table 
As
Return (  
    with   cte1(N)   As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
           cte2(N)   As (Select Top (IsNull(DataLength(@String),0)) Row_Number() over (Order By (Select NULL)) From (Select N=1 From cte1 a,cte1 b,cte1 c,cte1 d) A ),
           cte3(N)   As (Select 1 Union All Select t.N+DataLength(@Delimiter) From cte2 t Where Substring(@String,t.N,DataLength(@Delimiter)) = @Delimiter),
           cte4(N,L) As (Select S.N,IsNull(NullIf(CharIndex(@Delimiter,@String,s.N),0)-S.N,8000) From cte3 S)

    Select RetSeq = Row_Number() over (Order By A.N)
          ,RetVal = LTrim(RTrim(Substring(@String, A.N, A.L)))
    From   cte4 A
);
--Orginal Source http://www.sqlservercentral.com/articles/Tally+Table/72993/
--Much faster than str-Parse, but limited to 8K
--Select * from [dbo].[udf-Str-Parse-8K]('Dog,Cat,House,Car',',')
--Select * from [dbo].[udf-Str-Parse-8K]('John||Cappelletti||was||here','||')