July 11, 2021 at 3:42 pm
Hi,
My requirement is to split columns [Owner],[PersonAttending],[Type] into multiple rows if more than one value is there for the column. Attached is the code snippet. Please help!
Thanks,
PSB
CREATE TABLE #SplitColumnsToRows
(
ID INT,
Title nvarchar(1000),
[Owner] nvarchar(1000),
[PersonAttending] nvarchar(1000),
[Type] nvarchar(500)
)
Insert INTO #SplitColumnsToRows ( ID,Title,[Owner],[PersonAttending],[Type])
SELECT 1,'Title 1','Neil;Jennifer','Ronaldo;Ashok','End to End;BIN' UNION ALL
SELECT 2,'Title 2','Mohan;Sankara','Lisa;Holand','Support;BIN'
SELECT * FROM #SplitColumnsToRows
-- Desired output
SELECT 1 AS ID,'Title 1' AS Title,'Neil' AS [Owner],'Ronaldo' AS [PersonAttending],'End to End' AS [Type] UNION ALL
SELECT 1 AS ID,'Title 1' AS Title,'Jennifer' AS [Owner],'Ronaldo' AS [PersonAttending],'End to End' AS [Type] UNION ALL
SELECT 1 AS ID,'Title 1' AS Title,'Neil' AS [Owner],'Ashok' AS [PersonAttending],'BIN' AS [Type] UNION ALL
SELECT 1 AS ID,'Title 1' AS Title,'Jennifer' AS [Owner],'Ashok' AS [PersonAttending],'BIN' AS [Type] UNION ALL
SELECT 2 AS ID,'Title 2' AS Title,'Mohan' AS [Owner],'Lisa' AS [PersonAttending],'Support' AS [Type] UNION ALL
SELECT 2 AS ID,'Title 2' AS Title,'Sankara' AS [Owner],'Lisa' AS [PersonAttending],'Support' AS [Type] UNION ALL
SELECT 2 AS ID,'Title 2' AS Title,'Mohan' AS [Owner],'Holand' AS [PersonAttending],'BIN' AS [Type] UNION ALL
SELECT 2 AS ID,'Title 2' AS Title,'Sankara' AS [Owner],'Holand' AS [PersonAttending],'BIN' AS [Type]
DROP TABLE #SplitColumnsToRows
July 11, 2021 at 5:10 pm
It seems the data is ordinally JOIN'ed between PersonAttending and Type and CROSS JOIN'ed between PersonAttending and Owner. To do the ordinal splitting this uses dbo.DelimitedSplit8K_LEAD. Ordinal splitters and specifically dbo.DelimitedSplit8K_LEAD could be read about here and here.
;with
id_split_person_cte(id, ItemNumber, [PersonAttending]) as (
select id, splt_person.ItemNumber, splt_person.Item
from #SplitColumnsToRows sctr
cross apply dbo.DelimitedSplit8K_LEAD(sctr.[PersonAttending], ';') splt_person),
id_split_type_cte(id, ItemNumber, [Type]) as (
select id, splt_type.ItemNumber, splt_type.Item
from #SplitColumnsToRows sctr
cross apply dbo.DelimitedSplit8K_LEAD(sctr.[Type], ';') splt_type),
id_person_type_cte(id, ItemNumber, [PersonAttending], [Type]) as (
select p.*, t.[Type]
from id_split_person_cte p
join id_split_type_cte t on p.id=t.id
and p.ItemNumber=t.ItemNumber)
select sctr.ID, sctr.Title, splt_owner.Item, pt.*
from #SplitColumnsToRows sctr
join id_person_type_cte pt on sctr.ID=pt.id
cross apply dbo.DelimitedSplit8K_LEAD(sctr.[Owner], ';') splt_owner
order by sctr.id, pt.ItemNumber;
The code for dbo.DelimitedSplit8K_LEAD
CREATE FUNCTION [dbo].[DelimitedSplit8K_LEAD]
--===== Define I/O parameters
(@pString VARCHAR(8000), @pDelimiter CHAR(1))
RETURNS TABLE WITH SCHEMABINDING AS
RETURN
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
;
Aus dem Paradies, das Cantor uns geschaffen, soll uns niemand vertreiben können
July 11, 2021 at 6:22 pm
For ID 711 the output is not correct. Atta
CREATE TABLE #SplitColumnsToRows
(
ID INT,
Title nvarchar(1000),
[Owner] nvarchar(1000),
[PersonAttending] nvarchar(1000),
[Type] nvarchar(500)
)
Insert INTO #SplitColumnsToRows ( ID,Title,[Owner],[PersonAttending],[Type])
SELECT 711,'Training requirements','','Weiying Song;Muhammad Ismail Aftab;Saravana Kumar Rao;Rasha Kulari;Divya MacMilan;LaSonji Turner;Madalina Elena Holand','Communication;E2E' UNION ALL
SELECT 1,'Title 1','Neil Spencer;Jennifer Hudson','Ronaldo Mac;Ashok Nerula','End to End;BIN' UNION ALL
SELECT 2,'Title 2','Mohan Rao;Sankara Rao','Lisa Turner;Holand Mac','Support;BIN'
SELECT * FROM #SplitColumnsToRows
--'Weiying Song;Muhammad Ismail Aftab;Saravana Kumar Rao;Rasha Kulari;Divya MacMilan;LaSonji Turner;Madalina Elena Holand'
;with
id_split_person_cte(id, ItemNumber, [PersonAttending]) as (
select id, splt_person.ItemNumber, splt_person.Item
from #SplitColumnsToRows sctr
cross apply ODRM.dbo.DelimitedSplit8K_LEAD(sctr.[PersonAttending], ';') splt_person),
id_split_type_cte(id, ItemNumber, [Type]) as (
select id, splt_type.ItemNumber, splt_type.Item
from #SplitColumnsToRows sctr
cross apply ODRM.dbo.DelimitedSplit8K_LEAD(sctr.[Type], ';') splt_type),
id_person_type_cte(id, ItemNumber, [PersonAttending], [Type]) as (
select p.*, t.[Type]
from id_split_person_cte p
join id_split_type_cte t on p.id=t.id
and p.ItemNumber=t.ItemNumber)
select sctr.ID, sctr.Title, splt_owner.Item, pt.*
from #SplitColumnsToRows sctr
join id_person_type_cte pt on sctr.ID=pt.id
cross apply ODRM.dbo.DelimitedSplit8K_LEAD(sctr.[Owner], ';') splt_owner
order by sctr.id, pt.ItemNumber;
--Desired output
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Weiying Song' AS [PersonAttending],'Communication' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Muhammad Ismail Aftab' AS [PersonAttending],'Communication' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Saravana Kumar Rao' AS [PersonAttending],'Communication' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Rasha Kulari' AS [PersonAttending],'Communication' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Divya MacMilan' AS [PersonAttending],'Communication' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'LaSonji Turner' AS [PersonAttending],'Communication' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Madalina Elena Holand' AS [PersonAttending],'Communication' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Weiying Song' AS [PersonAttending],'E2E' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Muhammad Ismail Aftab' AS [PersonAttending],'E2E' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Saravana Kumar Rao' AS [PersonAttending],'E2E' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Rasha Kulari' AS [PersonAttending],'E2E' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Divya MacMilan' AS [PersonAttending],'E2E' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'LaSonji Turner' AS [PersonAttending],'E2E' AS [Type] UNION ALL
SELECT 711 AS ID,'Training requirements' AS Title,'' AS [Owner],'Madalina Elena Holand' AS [PersonAttending],'E2E' AS [Type]
DROP TABLE #SplitColumnsToRows
ched is the code.
July 11, 2021 at 9:07 pm
Got any more examples? It appears there are 2 sets of rules for the 2 different scenarios:
Scenario 1) Owner='' -----> (if [Owner]='' then PersonAttending and Type columns are CROSS JOIN'ed)
Scenario 2) Owner<>'' ---> (if [Owner]<>'' then PersonAttending and Type columns are ordinally JOIN'ed)
Does this seem correct?
Aus dem Paradies, das Cantor uns geschaffen, soll uns niemand vertreiben können
July 11, 2021 at 10:48 pm
;with
id_split_person_cte(id, [Owner], ItemNumber, [PersonAttending]) as (
select sctr.id, sctr.[Owner], splt_person.ItemNumber, splt_person.Item
from #SplitColumnsToRows sctr
cross apply dbo.DelimitedSplit8K_LEAD(sctr.[PersonAttending], ';') splt_person),
id_split_type_cte(id, [Owner], ItemNumber, [Type]) as (
select sctr.id, sctr.[Owner], splt_type.ItemNumber, splt_type.Item
from #SplitColumnsToRows sctr
cross apply dbo.DelimitedSplit8K_LEAD(sctr.[Type], ';') splt_type),
id_person_type_ne_cte(id, ItemNumber, [PersonAttending], [Type]) as (
select p.id, p.ItemNumber, p.[PersonAttending], t.[Type]
from id_split_person_cte p
join id_split_type_cte t on p.id=t.id
and p.ItemNumber=t.ItemNumber
where p.[Owner]<>''
and t.[Owner]<>''),
id_person_type_eq_cte(id, ItemNumber, [PersonAttending], [Type]) as (
select p.id, p.ItemNumber, p.[PersonAttending], t.[Type]
from id_split_person_cte p
join id_split_type_cte t on p.id=t.id
where p.[Owner]=''
and t.[Owner]='')
select sctr.ID, sctr.Title, splt_owner.Item, pt.*
from #SplitColumnsToRows sctr
join id_person_type_ne_cte pt on sctr.ID=pt.id
cross apply dbo.DelimitedSplit8K_LEAD(sctr.[Owner], ';') splt_owner
union all
select sctr.ID, sctr.Title, splt_owner.Item, pt.*
from #SplitColumnsToRows sctr
join id_person_type_eq_cte pt on sctr.ID=pt.id
cross apply dbo.DelimitedSplit8K_LEAD(sctr.[Owner], ';') splt_owner
order by sctr.id, pt.[Type], pt.ItemNumber;
Aus dem Paradies, das Cantor uns geschaffen, soll uns niemand vertreiben können
July 11, 2021 at 10:48 pm
Hi,
Thanks for getting back. There is no connection between [Owner],[PersonAttending],[Type] columns.
Thanks,
PSB
July 12, 2021 at 6:07 pm
Hi,
Thanks for getting back. There is no connection between [Owner],[PersonAttending],[Type] columns.
- While Owner column can be blank and [PersonAttending],[Type] still have values.
- Owner (different people than [PersonAttending]) <> [PersonAttending] and [Type] may or maynot have values
- Owner could be a subset of [PersonAttending] and [Type] may or maynot have values
- Owner have (single or multiple names) while PersonAttending is blank and [Type] may or maynot have values
Thanks,
PSB
This doesn't tell us the rules for how to join the data and provide the results. Without that - it isn't going to be possible to provide a solution.
Jeffrey Williams
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