T-SQL - remove chars from string beginning from specific character - sql

Question

from table I retrieves values, for example,
7752652:1,7752653:2,7752654:3,7752655:4
or
7752941:1,7752942:2
i.e. string may contain any quantity of substrings.
What I need: remove all occurrences of characters from char ':' to a comma char.
For example,
7752652:1,7752653:2,7752654:3,7752655:4
should be
7752652,7752653,7752654,7752655
How do it?

Answer 1

Replace : with start tag <X>.
Replace , with end tag </X> and an extra comma.
Add an extra end tag to the end </X>.
That will give you a string that look like 7752941<X>1</X>,7752942<X>2</X>.
Cast to XML and use query(text()) to get the root text values.
Cast the result back to string.
SQL Fiddle
MS SQL Server 2012 Schema Setup:
create table T
(
C varchar(100)
)
insert into T values
('7752652:1,7752653:2,7752654:3,7752655:4'),
('7752941:1,7752942:2')
Query 1:
select cast(cast(replace(replace(T.C, ':', '<X>'), ',', '</X>,')+'</X>' as xml).query('text()') as varchar(100)) as C
from T
Results:
| C |
|---------------------------------|
| 7752652,7752653,7752654,7752655 |
| 7752941,7752942 |

Answer 2

declare #query varchar(8000)
select #query= 'select '+ replace (
replace('7752652:1,7752653:2,7752654:3,7752655:4',',',' t union all select ')
,':',' t1 , ')
exec(';with cte as ( '+#query+' ) select cast(t1 as varchar)+'','' from cte for xml path('''')')

Answer 3

Try this:
DECLARE #Data VARCHAR(100) = '7752652:1,7752653:2,7752654:3,7752655:4'
DECLARE #Output VARCHAR(100) = ''
WHILE CHARINDEX(':', #Data) > 0
BEGIN
IF LEN(#Output) > 0 SET #Output = #Output + ','
SET #Output = #Output + LEFT(#Data, CHARINDEX(':', #Data)-1)
SET #Data = STUFF(#Data,
1,
(CASE CHARINDEX(',', #Data)
WHEN 0 THEN LEN(#Data)
ELSE CHARINDEX(',', #Data)
END) - CHARINDEX(':', #Data),
'')
END
SELECT #Output AS Result -- 7752652,7752653,7752654,7752655

Answer 4

Hope this will help.
I borrowed the Splitter function from here. You could use any delimiter parser you may already be using.
Parse the string to table values
Used Substring function to remove values after ':'
Use For xml to re-generate CSV
Test Data:'
IF OBJECT_ID(N'tempdb..#temp')>0
DROP TABLE #temp
CREATE TABLE #temp (id int, StringCSV VARCHAR(500))
INSERT INTO #temp VALUES ('1','7752652:1,7752653:2,7752654:3,7752655:4')
INSERT INTO #temp VALUES ('2','7752656:1,7752657:3,7752658:4')
INSERT INTO #temp VALUES ('3','7752659:1,7752660:2')
SELECT * FROM #temp t
Main Query:
;WITH cte_Remove(ID, REMOVE) AS
(
SELECT y.id AS ID,
SUBSTRING(fn.string, 1, CHARINDEX(':', fn.string) -1) AS Removed
FROM #temp AS y
CROSS APPLY dbo.fnParseStringTSQL(y.StringCSV, ',') AS fn
)
SELECT DISTINCT ID,
STUFF(
(
SELECT ',' + REMOVE
FROM cte_Remove AS t2
WHERE t2.ID = t1.ID
FOR XML PATH('')
),1,1,'') AS col2
FROM cte_Remove AS t1
Cleanup Test Data:
IF OBJECT_ID(N'tempdb..#temp') > 0
DROP TABLE #temp

Answer 5

I solved this problem with CLR function. It is more quickly and function can be used in complex queries
public static SqlString fnRemoveSuffics(SqlString source)
{
string pattern = #":(\d+)";
string replacement = "";
string result = Regex.Replace(source.Value, pattern, replacement);
return new SqlString(result);
}