Store values in different variables in SQL, separated by (Comma) "," - mysql

Question

I need to separate values and store them in different variables in SQL,
for example
a='3100,3101,3102,....'
And the output should be
x=3100
y=3101
z=3102
.
.
.

Answer 1

create function [dbo].[udf_splitstring] (#tokens varchar(max),
#delimiter varchar(5))
returns #split table (
token varchar(200) not null )
as
begin
declare #list xml
select #list = cast('<a>'
+ replace(#tokens, #delimiter, '</a><a>')
+ '</a>' as xml)
insert into #split
(token)
select ltrim(t.value('.', 'varchar(200)')) as data
from #list.nodes('/a') as x(t)
return
end
GO
declare #cad varchar(100)='3100,3101,3102'
select *,ROW_NUMBER() over (order by token ) as rn from udf_splitstring(#cad,',')
token rn
3100 1
3101 2
3102 3

Answer 2

The results of the Parse TVF can easily be incorporated into a JOIN, or an IN
Declare #a varchar(max)='3100,3101,3102'
Select * from [dbo].[udf-Str-Parse](#a,',')
Returns
RetSeq RetVal
1 3100
2 3101
3 3102
The UDF if needed (much faster than recursive, loops, and xml)
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','||')

Answer 3

I suggest you to use following query, it's much faster than other functions like cross apply and udf.
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<>''
and also you should create a table 'NUMBER' before running the above query.
CREATE TABLE TB (Number INT)
DECLARE #I INT=0
WHILE #I<1000
BEGIN
INSERT INTO TB VALUES (#I)
SET #I=#I+1
END