How to use a table value function that splits a string

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How to use a table value function that splits a string

NineIron

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Points: 12529
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July 13, 2016 at 12:33 pm

#309045

I have a TVF that takes two parameters, string and delimter but, I don't know how to pass the field values into the function in order to get my resulting table of parsed data.
Let's say that this query pulls the delimited data.
select StringToBeParsed
from Table1
How do I pass this field, StringToBeParsed, into the function, dbo.fnSplitString(@String, @delimiter). The delimiter is a pipe(|).

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Sean Lange SSC Guru Points: 286562 More actions · Answer 1

NineIron (7/13/2016)
I have a TVF that takes two parameters, string and delimter but, I don't know how to pass the field values into the function in order to get my resulting table of parsed data.
Let's say that this query pulls the delimited data.
select StringToBeParsed
from Table1
How do I pass this field, StringToBeParsed, into the function, dbo.fnSplitString(@String, @delimiter). The delimiter is a pipe(|).

I don't know what your split function is doing but typically this is done with cross apply. Take a look at the article in my signature about splitting strings.

My guess is you want something along these lines.

select t.*, s.*

from Table1 t

cross apply dbo.fnSplitString(t.StringToBeParsed, '|') s

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

Jeff Moden SSC Guru Points: 1000539 More actions · Answer 2

NineIron (7/13/2016)
I have a TVF that takes two parameters, string and delimter but, I don't know how to pass the field values into the function in order to get my resulting table of parsed data.
Let's say that this query pulls the delimited data.
select StringToBeParsed
from Table1
How do I pass this field, StringToBeParsed, into the function, dbo.fnSplitString(@String, @delimiter). The delimiter is a pipe(|).

Please post the code for that function. I've found that many are seriously lacking in the areas of performance and resource usage.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.
"Change is inevitable... change for the better is not".

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)
Intro to Tally Tables and Functions

NineIron SSChampion Points: 12529 More actions · Answer 3

Here's the function. I got it from your site. I think the blog author's last name is Patel.

CREATE FUNCTION [dbo].[fnSplitString]

(

@string NVARCHAR(MAX),

@delimiter CHAR(1)

)

RETURNS @output TABLE(splitdata NVARCHAR(MAX)

)

BEGIN

DECLARE @start INT, @end INT

SELECT @start = 1, @end = CHARINDEX(@delimiter, @string)

WHILE @start < LEN(@string) + 1 BEGIN

IF @end = 0

SET @end = LEN(@string) + 1

INSERT INTO @output (splitdata)

VALUES(SUBSTRING(@string, @start, @end - @start))

SET @start = @end + 1

SET @end = CHARINDEX(@delimiter, @string, @start)

END

RETURN

END

NineIron SSChampion Points: 12529 More actions · Answer 4

This is some test data. Not all rows will have a delimited string value.

create table #Test

(

QuerySetID int,

QueryNumberID int,

QueryValue varchar(100)

)

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,15,'{Taxi Voucher}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,7,'{Assessment/Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Counseling|Community Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,16,'N')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Collateral Contacts|Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,3,'{Referred to Outside Agenc}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,6,'{Outpatient Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Collateral Contacts|Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,16,'N')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Collateral Contacts|Community Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,3,'{Referred to Outside Agenc}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,10,'{Services Declined}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,6,'{Return to Prior Services}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Collateral Contacts|Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,6,'{Outpatient Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,10,'{Outpatient Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Primary Care Referral}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,10,'{Return to Prior Services}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,3,'{Referred to Financial Con}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Collateral Contacts}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,10,'{Services Declined}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Counseling|Community Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,6,'{Outpatient Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,10,'{AA/NA|Return to Prior Services}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Collateral Contacts|Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Counseling}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,6,'{Return to Prior Services}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Collateral Contacts|Counseling|Skilled Nursing Facility}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,3,'{Long Term Care Applicatio}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,17,'{Primary Care Referral}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,15,'{Taxi Voucher}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,6,'{Outpatient Program}')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,16,'N')

insert into #Test(QuerySetID, QueryNumberID, QueryValue) values(7,9,'SW Services not Needed')