Create a function to split delimited string into a table - mysql

Question

In order to split delimited string, I would need the creation of a function returning a table and taking a comma separated string as parameter.
For instance, have a look at this input table:
Using the function, the result would be:
In this case, the delimited string is the Person column that should be taken as parameter.
Thanks in advance.

Answer 1

Try this one
--Build Schema for Your Case
DECLARE #TAB TABLE (ID INT, NAME VARCHAR(1000))
INSERT INTO #TAB
SELECT 1,'Pravesh,Simon'
UNION ALL
SELECT 2,'Me,Myself,I'
--Used Recursive CTE to achieve Tabular view of Comma Separated Column
--Used While loop to take next row
--Used Table Variable #RESULT to store your Result Set
DECLARE #ID INT, #T VARCHAR(100), #SNO INT= 1, #MAX_SNO INT
DECLARE #RESULT TABLE (ID INT, NAME VARCHAR(1000))
SELECT #SNO=1, #MAX_SNO =MAX(ID) FROM #TAB
WHILE(#SNO<=#MAX_SNO)
BEGIN
SELECT #ID = ID, #T = NAME FROM #TAB WHERE ID=#SNO
SET #T =#T+','
;WITH MyCTE(Start,[End]) AS(
SELECT 1 AS Start,CHARINDEX(',',#T,1) AS [End]
UNION ALL
SELECT [End]+1 AS Start,CHARINDEX(',',#T,[End]+1)AS [End]
from MyCTE where [End]<LEN(#T)
)
INSERT INTO #RESULT
Select #SNO AS ID, SUBSTRING(#T,Start,[End]-Start) NAME from MyCTE;
SET #SNO+=1
END
--Getting Result Set
SELECT * FROM #RESULT
Edit: From Your Comments
If you want to do the above with a function, this one far easy than above looping.
CREATE FUNCTION [DBO].[FN_SPLIT_STR_TO_COL] (#T AS VARCHAR(4000) )
RETURNS
#RESULT TABLE(VALUE VARCHAR(250))
AS
BEGIN
SET #T= #T+','
;WITH MYCTE(START,[END]) AS(
SELECT 1 AS START,CHARINDEX(',',#T,1) AS [END]
UNION ALL
SELECT [END]+1 AS START,CHARINDEX(',',#T,[END]+1)AS [END]
FROM MYCTE WHERE [END]<LEN(#T)
)
INSERT INTO #RESULT
SELECT SUBSTRING(#T,START,[END]-START) NAME FROM MYCTE;
RETURN
END
Now just call the function for every row by passing column to it.
With Cross Apply
SELECT ID,FN_RS.VALUE FROM #TAB
CROSS APPLY
(SELECT * FROM [DBO].[FN_SPLIT_STR_TO_COL] (NAME)) AS FN_RS

Answer 2

TRY THIS QUERY
//Which will work only when having 3 comma only
SELECT Id,SUBSTRING_INDEX(SUBSTRING_INDEX(`Person`, ',', 1), ',', -1) as Person
FROM `table`
UNION
select Id,SUBSTRING_INDEX(SUBSTRING_INDEX(`Person`, ',', 2), ',', -1) as Person
FROM `table`
UNION
select Id,SUBSTRING_INDEX(SUBSTRING_INDEX(`Person`, ',', 3), ',', -1) as Person
FROM `table`
order by Id ASC

Answer 3

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
create table #dup
( id int, name varchar(100)
)
insert into #dup values
(1,'leela,venkatesh,don'),
(2,'john,smith,lewis')
select id,b.token from #dup
cross apply
(select token from udf_splitstring(name,',') )b