Sql Query Join on Comma Separated Value - sql

Question

I have a table that has a composite key and a comma separated value. I need the single row split into one row for each comma separated element. I have seen similar questions and similar answers but have not been able to translate them into a solution for myself.
I'm running SQL Server 2008 R2.
| Key Part 1 | Key Part 2 | Key Part 3 | Values |
|------------------------------------------------------|
| A | A | A | PDE,PPP,POR |
| A | A | B | PDE,XYZ |
| A | B | A | PDE,RRR |
|------------------------------------------------------|
and I need this as output
| Key Part 1 | Key Part 2 | Key Part 3 | Values | Sequence |
|-------------------------------------------------------------------|
| A | A | A | PDE | 0 |
| A | A | A | PPP | 1 |
| A | A | A | POR | 2 |
| A | A | B | PDE | 0 |
| A | A | B | XYZ | 1 |
| A | B | A | PDE | 0 |
| A | B | A | RRR | 1 |
|-------------------------------------------------------------------|
Thanks
Geoff

Answer 1

Here is a simple inline approach if you don't have or want a Split/Parse UDF
Example
Select A.[Key Part 1]
,A.[Key Part 2]
,A.[Key Part 3]
,B.*
From YourTable A
Cross Apply (
Select [Values] = LTrim(RTrim(X2.i.value('(./text())[1]', 'varchar(max)')))
,[Sequence] = Row_Number() over (Order By (Select null))-1
From (Select x = Cast('<x>' + replace(A.[Values],',','</x><x>')+'</x>' as xml)) X1
Cross Apply x.nodes('x') X2(i)
) B
Returns
EDIT - If Open to a Table-Valued Function
The Query would Look Like This
Select A.[Key Part 1]
,A.[Key Part 2]
,A.[Key Part 3]
,[Values] = B.RetVal
,[Sequence] = B.RetSeq-1
From #YourTable A
Cross Apply [dbo].[udf-Str-Parse-8K](A.[Values],',') B
The UDF if Interested
CREATE FUNCTION [dbo].[udf-Str-Parse-8K] (#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/
--Select * from [dbo].[udf-Str-Parse-8K]('Dog,Cat,House,Car',',')
--Select * from [dbo].[udf-Str-Parse-8K]('John||Cappelletti||was||here','||')

Answer 2

If all CSV values are exactly 3 characters (as you have in your test data) you can use a a tally table in an incredibly efficient manner by creating the exact number of rows needed up front (as opposed to creating a row for every character to find the delimiter character)... because you already know the delimiter location.
In this case, I'll use a tally function but you can use a fixed tally table as well.
Code for the tfn_Tally function...
SET QUOTED_IDENTIFIER ON
SET ANSI_NULLS ON
GO
CREATE FUNCTION dbo.tfn_Tally
/* ============================================================================
07/20/2017 JL, Created. Capable of creating a sequense of rows
ranging from -10,000,000,000,000,000 to 10,000,000,000,000,000
============================================================================ */
(
#NumOfRows BIGINT,
#StartWith BIGINT
)
RETURNS TABLE WITH SCHEMABINDING AS
RETURN
WITH
cte_n1 (n) AS (SELECT 1 FROM (VALUES (1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) n (n)), -- 10 rows
cte_n2 (n) AS (SELECT 1 FROM cte_n1 a CROSS JOIN cte_n1 b), -- 100 rows
cte_n3 (n) AS (SELECT 1 FROM cte_n2 a CROSS JOIN cte_n2 b), -- 10,000 rows
cte_n4 (n) AS (SELECT 1 FROM cte_n3 a CROSS JOIN cte_n3 b), -- 100,000,000 rows
cte_Tally (n) AS (
SELECT TOP (#NumOfRows)
(ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) - 1) + #StartWith
FROM
cte_n4 a CROSS JOIN cte_n4 b -- 10,000,000,000,000,000 rows
)
SELECT
t.n
FROM
cte_Tally t;
GO
How to use it in the solution...
-- create some test data...
IF OBJECT_ID('tempdb..#TestData', 'U') IS NOT NULL
DROP TABLE #TestData;
CREATE TABLE #TestData (
KeyPart1 CHAR(1),
KeyPart2 CHAR(1),
KeyPart3 CHAR(1),
[Values] varchar(50)
);
INSERT #TestData (KeyPart1, KeyPart2, KeyPart3, [Values]) VALUES
('A', 'A', 'A', 'PDE,PPP,POR'),
('A', 'A', 'B', 'PDE,XYZ'),
('A', 'B', 'A', 'PDE,RRR,XXX,YYY,ZZZ,AAA,BBB,CCC');
--==========================================================
-- solution query...
SELECT
td.KeyPart1,
td.KeyPart2,
td.KeyPart3,
x.SplitValue,
[Sequence] = t.n
FROM
#TestData td
CROSS APPLY dbo.tfn_Tally(LEN(td.[Values]) - LEN(REPLACE(td.[Values], ',', '')) + 1, 0) t
CROSS APPLY ( VALUES (SUBSTRING(td.[Values], t.n * 4 + 1, 3)) ) x (SplitValue);
And the results...
KeyPart1 KeyPart2 KeyPart3 SplitValue Sequence
-------- -------- -------- ---------- --------------------
A A A PDE 0
A A A PPP 1
A A A POR 2
A A B PDE 0
A A B XYZ 1
A B A PDE 0
A B A RRR 1
A B A XXX 2
A B A YYY 3
A B A ZZZ 4
A B A AAA 5
A B A BBB 6
A B A CCC 7
If the assumption that all of the csv elements are the number of characters is incorrect, you'd be better off using a traditional tally based splitter. In which case my recommendation is DelimitedSplit8K written by Jeff Moden.
In that case, the solution query would look like this...
SELECT
td.KeyPart1,
td.KeyPart2,
td.KeyPart3,
SplitValue = dsk.Item,
[Sequence] = dsk.ItemNumber - 1
FROM
#TestData td
CROSS APPLY dbo.DelimitedSplit8K(td.[Values], ',') dsk;
Ann the result...
KeyPart1 KeyPart2 KeyPart3 SplitValue Sequence
-------- -------- -------- ---------- --------------------
A A A PDE 0
A A A PPP 1
A A A POR 2
A A B PDE 0
A A B XYZ 1
A B A PDE 0
A B A RRR 1
A B A XXX 2
A B A YYY 3
A B A ZZZ 4
A B A AAA 5
A B A BBB 6
A B A CCC 7
HTH, Jason

Answer 3

-- Create Table
Create table YourTable
(
p1 varchar(50),
p2 varchar(50),
p3 varchar(50),
pval varchar(50)
)
go
-- Insert Data
insert into YourTable values ('A','A','A','PDE,PPP,POR'),
('A','A','B','PDE,XYZ'),('A','B','A','PDE,RRR')
go
-- View Sample Data
SELECT p1, p2, p3 , pval FROM YourTable
go
-- Required Result
SELECT p1,p2,p3, LTRIM(RTRIM(Split.a.value('.', 'VARCHAR(100)'))) as Value1 , ROW_NUMBER() OVER(PARTITION BY id ORDER BY id ASC)-1 AS SequenceNo
FROM
(SELECT ROW_NUMBER() over (order by (SELECT NULL)) AS ID, p1,p2,p3, pval, CAST ('<M>' + REPLACE(pval, ',', '</M><M>') + '</M>' AS XML) AS Data from YourTable
) AS A
CROSS APPLY Data.nodes ('/M') AS Split(a)
go
-- Remove Temp created table
drop table YourTable
go