Remove 'cross' duplicate result for double cross apply - sql

Question

I have the following data in a column:
5;ABC|1;XYZ
I would like to split the value on the '|' delimiter and then split every result on the ';' delimiter.
I have the following query, but unfortenately it gives me (sort of) duplicate results.
DECLARE #MyTable TABLE ( Code VARCHAR(100) )
INSERT INTO #MyTable
VALUES ( '5;ABC|1;XYZ' );
WITH Query AS
(
SELECT T1.RowNum, SubSplit.Value FROM
(
SELECT ROW_NUMBER() OVER (ORDER BY Code) as RowNum, Split.Value FROM #MyTable
CROSS APPLY SplitString(Code, '|') AS Split
) T1
CROSS APPLY SplitString(Value, ';') AS SubSplit
)
SELECT q1.Value AS [Left], q2.Value AS [Right] FROM Query q1
INNER JOIN Query q2 ON q1.RowNum = q2.RowNum AND q1.Value <> q2.Value
The result is:
But what I would like is:
How can I achieve this?
Edit
For completeness, this is the SplitString function I use:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION SplitString
(
-- Add the parameters for the function here
#input varchar(8000),
#delimiter varchar(1)
)
RETURNS TABLE
AS
RETURN
(
WITH cte AS
(
SELECT 0 a, 1 b
UNION ALL
SELECT b, CHARINDEX(#delimiter, #input, b) + LEN(#delimiter)
FROM CTE
WHERE b > a
)
SELECT SUBSTRING(#input, a,
CASE WHEN b > LEN(#delimiter)
THEN b - a - LEN(#delimiter)
ELSE LEN(#input) - a + 1 END) Value
FROM cte WHERE a > 0
)
GO

Answer 1

Add another ROW_NUMBER in the outer query:
SQL Fiddle
Query 1:
DECLARE #MyTable TABLE ( Code VARCHAR(100) )
INSERT INTO #MyTable
VALUES ( '5;ABC|1;XYZ|6;HXS|7;GGH' )
;WITH Query AS
(
SELECT T1.RowNum, SubSplit.Value,
ROW_NUMBER() OVER (PARTITION BY T1.RowNum ORDER BY SubSplit.Value) as RowNum1
FROM
(
SELECT ROW_NUMBER() OVER (ORDER BY Code) as RowNum, Split.Value FROM #MyTable
CROSS APPLY SplitString(Code, '|') AS Split
) T1
CROSS APPLY SplitString(Value, ';') AS SubSplit
)
SELECT q1.Value AS [Left], q2.Value AS [Right] FROM Query q1
INNER JOIN Query q2 ON q1.RowNum = q2.RowNum AND q1.RowNum1 = 1 AND q2.RowNum1 = 2
Results:
| Left | Right |
|------|-------|
| 5 | ABC |
| 1 | XYZ |
| 6 | HXS |
| 7 | GGH |
Update:
The use of the ROW_NUMBER() in the outer query will only work if the Left is less then Right when diong the string comparison. It will not work correctly for the '6;123' value. Therefore, there is a better approach by using an enhanced SplitString function as per below:
SQL Fiddle
MS SQL Server 2014 Schema Setup:
CREATE FUNCTION SplitString
(
-- Add the parameters for the function here
#input varchar(8000),
#delimiter varchar(1)
)
RETURNS TABLE
AS
RETURN
(
WITH cte AS
(
SELECT 0 a, 1 b, 0 rn
UNION ALL
SELECT b, CHARINDEX(#delimiter, #input, b) + LEN(#delimiter), rn + 1
FROM CTE
WHERE b > a
)
SELECT SUBSTRING(#input, a,
CASE WHEN b > LEN(#delimiter)
THEN b - a - LEN(#delimiter)
ELSE LEN(#input) - a + 1 END) Value,
rn
FROM cte WHERE a > 0
)
Query 1:
DECLARE #MyTable TABLE ( Code VARCHAR(100) )
INSERT INTO #MyTable
VALUES ( '5;ABC|1;XYZ|6;123|7;GGH' )
;WITH Query AS
(
SELECT T1.RowNum, SubSplit.Value,
SubSplit.rn as RowNum1
FROM
(
SELECT Split.rn as RowNum, Split.Value FROM #MyTable
CROSS APPLY SplitString(Code, '|') AS Split
) T1
CROSS APPLY SplitString(Value, ';') AS SubSplit
)
SELECT q1.Value AS [Left], q2.Value AS [Right] FROM Query q1
INNER JOIN Query q2 ON q1.RowNum = q2.RowNum AND q1.RowNum1 = 1 AND q2.RowNum1 = 2
Results:
| Left | Right |
|------|-------|
| 5 | ABC |
| 1 | XYZ |
| 6 | 123 |
| 7 | GGH |