Ask Help to split string by split‘;&;’

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Ask Help to split string by split‘;&;’

kingster

Old Hand

Points: 331
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August 29, 2022 at 5:12 am

#4081454

Can someone help me figure out how to turn this string:
' a=abc;&;b=1;&;c=ddd'
into a set of results like this?
Item Value
a abc
b 1
c ddd

Viewing 6 posts - 1 through 5 (of 5 total)

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Vedat ÖZER SSC Enthusiast Points: 103 More actions · Answer 1

DECLARE @String VARCHAR(50) = 'a=abc;&;b=1;&;c=ddd', @Delimiter CHAR(1) =';'
SELECT
SUBSTRING(VALUE,1,CHARINDEX('=',VALUE)-1) ITEMS,
SUBSTRING(VALUE,CHARINDEX('=',VALUE)+1,9999) AS VALUE
FROM STRING_SPLIT(@String,@Delimiter) where value <>'&'

Allah bize yeter, O ne güzel vekildir.

vedatoozer@gmail.com

Eirikur Eiriksson SSC Guru Points: 182901 More actions · Answer 2

There are several ways of achieving this, and selecting the best option depends on various factors.

😎

Quick questions:

How are you retrieving the raw values?
Are the raw values in a variable (procedural parameter etc.)?
What version of SQL Server are you using?
What are the sizes and cardinality?
Do you intend to do this in a function, in a procedure or in a code snipped?

Here is an example

USE TEEST;
GO
SET NOCOUNT ON;
GO
-- Sample string does not appear correctly so it is left blank, missing the '&' sign
DECLARE @RAWSTR VARCHAR(100) = ''; -- paste your string here
;WITH BASE_DATA AS 
(
    SELECT 
       ROW_NUMBER() OVER (ORDER BY @@VERSION) AS RID
       ,FX.value
    -- replace the [split chars] with the '&' and semicolon combination
    FROM string_split(REPLACE(@RAWSTR,'[split chars]',CHAR(124)),CHAR(124)) AS FS
    CROSS APPLY string_split(FS.value,CHAR(61)) AS FX
)
,COLUMN_DATA AS
(
    SELECT
        CASE WHEN BD.RID % 2 = 1 THEN BD.value END AS Item
       ,CASE WHEN BD.RID % 2 = 1 THEN LEAD(BD.value,1) OVER (ORDER BY BD.RID ASC) END AS [Value]
    FROM BASE_DATA BD
)
SELECT
    CD.Item
   ,CD.Value
FROM COLUMN_DATA CD
WHERE CD.Item IS NOT NULL;

This reply was modified 2 years, 2 months ago by Eirikur Eiriksson.
This reply was modified 2 years, 2 months ago by Eirikur Eiriksson.
This reply was modified 2 years, 2 months ago by Eirikur Eiriksson.

ScottPletcher SSC Guru Points: 101073 More actions · Answer 3

I'd jury-rig this one: replace the 3 chars with a single char, then use the "standard" splitter:

;WITH test_data AS (
    SELECT ' a=abc;&;b=1;&;c=ddd' AS string
)
SELECT SUBSTRING('abcdefghijklmnopqrstuvwxyz', ds.ItemNumber, 1) AS Item, ds.Item AS Value
FROM test_data td
CROSS APPLY (
    SELECT REPLACE(string, ';&;', CHAR(7)) AS adjusted_string
) AS ca1
CROSS APPLY dbo.DelimitedSplit8K(adjusted_string, CHAR(7)) AS ds

SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".

Eirikur Eiriksson SSC Guru Points: 182901 More actions · Answer 4

You might want to use the Lead version of the splitter

😎

CREATE FUNCTION [dbo].[DelimitedSplit8K_LEAD]
--===== Define I/O parameters
        (@pString VARCHAR(8000), @pDelimiter CHAR(1))
RETURNS TABLE WITH SCHEMABINDING AS
 RETURN
--===== "Inline" CTE Driven "Tally Table” produces values from 0 up to 10,000...
     -- enough to cover VARCHAR(8000)
WITH E1(N) AS (
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
                ),                          --10E+1 or 10 rows
       E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
       E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max
 cteTally(N) AS (--==== This provides the "zero base" and limits the number of rows right up front
                     -- for both a performance gain and prevention of accidental "overruns"
                 SELECT 0 UNION ALL
                 SELECT TOP (DATALENGTH(ISNULL(@pString,1))) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
                ),
cteStart(N1) AS (--==== This returns N+1 (starting position of each "element" just once for each delimiter)
                 SELECT t.N+1
                   FROM cteTally t
                  WHERE (SUBSTRING(@pString,t.N,1) = @pDelimiter OR t.N = 0) 
                )
--===== Do the actual split. The ISNULL/NULLIF combo handles the length for the final element when no delimiter is found.
 SELECT ItemNumber = ROW_NUMBER() OVER(ORDER BY s.N1),
        Item = SUBSTRING(@pString,s.N1,ISNULL(NULLIF((LEAD(s.N1,1,1) OVER (ORDER BY s.N1) - 1),0)-s.N1,8000))
   FROM cteStart s
;
GO

Jeff Moden SSC Guru Points: 1004280 More actions · Answer 5

Eirikur Eiriksson wrote:

You might want to use the Lead version of the splitter

I absolutely agree. In fact, my personal copy of DelimitedSplit8K has Eirikur's wonderful performance improvement in it (and has since he wrote the article) along with credit for the excellent mod.

I kept the name the same so that I wouldn't have to change a shedload of code.

--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)