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SQL Server Pivot Table with multiple column aggregates
(3 answers)
Closed 3 years ago.
Hi I have sample data
Declare #table table
(Name Varchar(10),
Cnt INT,
Vol INT,
Descc VARCHAR(10))
INSERT INTO #table(Name,cnt,vol,Descc)values ('Mohan',21,8,'Fed')
INSERT INTO #table(Name,cnt,vol,Descc)values ('Mohan',1,391,'Fed:::')
Data :
Name Cnt Vol Descc
Mohan 21 8 Fed
Mohan 1 391 Fed:::
How can I get output like this
Name Cnt1 Vol1 Descc1 cnt2 vol2 Descc2
Mohan 21 8 Fed 1 391 Fed::
script I have followed :
Select [1],[2] from (
select NAme,Cnt,vol,DESCc,ROW_NUMBER()OVER(PARTITION BY ID ORDER BY (SELECT NULL))P,'P'+CAST(ROW_NUMBER()OVER(PARTITION BY ID ORDER BY (SELECT NULL))AS VARCHAR)PP from #table )T
PIVOT (MAX(ID) FOR P IN ([1],[2])) AS P
PIVOT (MAX(ID) FOR PP IN ([P1],[P2])) AS P
You can do conditional aggregation :
select Name, max(case when seq = 1 then Cnt end) as cnt1,
max(case when seq = 1 then Vol end) as Vol1,
max(case when seq = 1 then Descc end) as Descc1,
max(case when seq = 2 then Cnt end) as cnt2,
max(case when seq = 2 then Vol end) as Vol2,
max(case when seq = 2 then Descc end) as Descc2
from (select t.*, row_number() over (partition by name order by (select 1 )) as seq
from #table t
) t
group by Name;
Here is a db<>fiddle.
By Dynamic sql
IF OBJECT_ID('tempdb..#TEMP') IS NOT NULL
DROP TABLE #TEMP
DECLARE #table table
(
Name Varchar(10),
Cnt INT,
Vol INT,
Descc VARCHAR(10)
)
INSERT INTO #table(Name,cnt,vol,Descc)values ('Mohan',21,8,'Fed')
INSERT INTO #table(Name,cnt,vol,Descc)values ('Mohan',1,391,'Fed')
;WITH CTE
AS
(
SELECT
ROW_NUMBER()OVER(ORDER BY Name) AS Id,*
FROM #table i
)
SELECT ROW_NUMBER()OVER(ORDER BY (SELECT NULL)) AS Seq,
id,
Name,
Data1,
Data2
+CAST(id AS VARCHAR(10)) AS ReqCol
INTO #TEMP
FROM CTE
CROSS APPLY (VALUES ( CAST(CNT AS varchar(10)),'CNT'),
(CAST(Vol AS varchar(10)),'vol'),
(Descc,'Descc')
)AS Dt (Data1,Data2)
SET NOCOUNT ON
DECLARE #Sql nvarchar(max),
#DynamicColumn nvarchar(max),
#MaxDynamicColumn nvarchar(max)
SELECT #DynamicColumn = STUFF((SELECT ', '+QUOTENAME(CAST(ReqCol AS VARCHAR(10)))
FROM #TEMP ORDER BY Seq FOR XML PATH ('')),1,1,'')
SELECT #MaxDynamicColumn = STUFF((SELECT ', '+'MAX('+QUOTENAME(CAST(ReqCol AS VARCHAR(10)))+') AS '+QUOTENAME(CAST(ReqCol AS VARCHAR(10)))
FROM #TEMP ORDER BY Seq FOR XML PATH ('')),1,1,'')
SET #Sql='SELECT Name,'+ #MaxDynamicColumn+'
FROM
(
SELECT * FROM #TEMP
)AS src
PIVOT
(
MAX(Data1) FOR [ReqCol] IN ('+#DynamicColumn+')
) AS Pvt
GROUP BY Name '
EXEC (#Sql)
PRINT #Sql
SET NOCOUNT OFF
Result
Name CNT1 vol1 Descc1 CNT2 vol2 Descc2
---------------------------------------------------------
Mohan 21 8 Fed 1 391 Fed
I have columns something like this:
col1 | col2 | col3 | col4 | col5 | col6 |
-----+------+------+------+------+------+
a | b | c | a | c | c
I am trying to get unique values in the column it self PER row.
So ideally, I want a,b,c to be returned
I tried doing PIVOT and applying a DISTINCT but that doesn't go well as there are other columns that I couldn't show in the question.
So is there another way that this could be obtained?
Thanks in advance
Is this what you are looking for ..?
IF OBJECT_ID('tempdb..#Pivot_data')IS NOT NULL
DROP TABLE #Pivot_data
IF OBJECT_ID('tempdb..#tab')IS NOT NULL
DROP TABLE #tab
select * into #tab from
(select 'a'AS COL1,'b'AS COL2,'c'AS COL3,'a'AS COL4,'c'AS COL5,'c' COL6)AS A
DECLARE #Columns nvarchar(max) ,#QUERY NVARCHAR(MAX)
;WITH CTE AS (
SELECT COLUMNSS,COL_VALUES,ROW_NUMBER()OVER(PARTITION BY COL_VALUES ORDER BY (SELECT 1))RN FROM (
SELECT * FROM #tab
)AS A
UNPIVOT(COL_VALUES FOR COLUMNSS IN([col1],[col2],[col3],[col4],[col5],[col6])) AS B
)
,FINAL_Result as (select COLUMNSS,COL_VALUES from CTE where RN=1)
SELECT * INTO #Pivot_data FROM FINAL_Result
SET #Columns= (SELECT STUFF((SELECT ',['+COLUMNSS+']' FROM #Pivot_data FOR XML PATH('')),1,1,''))
SET #QUERY=N'SELECT * FROM (
SELECT * FROM #Pivot_data
) AS A
PIVOT (MAX(COL_VALUES)FOR COLUMNSS IN('+#Columns+'))
AS B'
PRINT #QUERY
EXEC (#QUERY)
Logic :
From the given table i did unpivot and generated a Row_number() based on the column values and considered only which are Row_num=1 i.e Distinct columns values . and finally, i Pivoted the resultant data .
It seems to be CROSS APPLY would be work here
select a.Col from table t
cross apply (
values (t.Col1), (t.Col2), (t.Col3),
(t.Col4), (t.Col5), (t.Col6)
)a(Col)
group by a.Col
AND, do the PIVOT with your own way
Try this code
IF OBJECT_ID('tempdb..#Temptab')IS NOT NULL
DROP TABLE #Temptab
;With cte(col1 , col2 , col3 , col4 , col5 , col6 )
AS
(
SELECT 'a' , 'b' , 'c' , 'a' , 'c' , 'c'
)
SELECT DISTINCT AllColumn
INTO #Temptab FROM cte
CROSS APPLY ( VALUES (col1),( col2) , (col3) , (col4) , (col5) , (col6)
) AS A (AllColumn)
DECLARE #SqlQuery nvarchar(max)
,#Sql nvarchar(max)
SELECT #SqlQuery='SELECT DISTINCT '+STUFF((SELECT ', '+ReqColumn FROM
(
SELECT ''''+AllColumn +'''' +' AS Col'+ CAST(Seq AS VARCHAR(2)) As ReqColumn
FROm
(
SELECT ROW_NUMBER()OVER(Order by AllColumn) AS Seq,AllColumn FROM #Temptab
)dt
)dte FOR XML PATH ('')),1,1,'') +' From #Temptab'
PRINT #SqlQuery
EXEC(#SqlQuery)
Result
Col1 Col2 Col3
----------------------
a b c
You can first union all columns to get unique values and then use the GROUP_CONCAT() function in MySql or if your database is Oracle then use list_agg() function:
Please try the below SQL:
select GROUP_CONCAT(col1 SEPARATOR ', ') from (
select '1' as 'serial', col1 from pivot
union
select '1' as 'serial',col2 from pivot
union
select '1' as 'serial',col3 from pivot
union
select '1' as 'serial',col4 from pivot
union
select '1' as 'serial',col5 from pivot
union
select '1' as 'serial' ,col6 from pivot
)derived
GROUP BY serial;
Output:
Note : I have make the 'serial' column in my query to do the group by. You can use the your identifier field in group by clause if you have any.
I am trying to insert values into a table that come from an other (lookup) table.
The first 3 results from the table are selected and need to be concatenated before they are inserted into an other table.
How can I alter the following insert to first concatenates them with no separation characters between the 3 names (example: JohnMaxLouise)?
INSERT INTO Table 2 VALUES ((SELECT TOP 3 names FROM Table1 ORDER BY NEWID()))
I am using SQL Server 2016 so string_agg is not available.
Personally, I think this is simplest with conditional aggregation:
INSERT INTO Table2
SELECT (MAX(CASE WHEN seqnum = 1 THEN name ELSE '' END) +
MAX(CASE WHEN seqnum = 2 THEN name ELSE '' END) +
MAX(CASE WHEN seqnum = 3 THEN name ELSE '' END)
)
FROM (SELECT name, ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) as seqnum
FROM (SELECT TOP 3 name
FROM Table1
ORDER BY NEWID()
) t
) t;
An alternative is an XML approach, but if you know you want three, then conditional aggregation (or pivot) works fine.
try the following:
declare #tab table (names varchar(max))
declare #tab1 table ([name] varchar(100))
insert into #tab1
select 'John' union select 'Max' union select 'Louise' union select 'xxx'
insert into #tab select (select top 3 [name] + '' from #tab1 for xml path(''))
select * from #tab
Thanks.
This will return '1,2,3,4'
DECLARE #x TABLE (i INTEGER)
DECLARE #r VARCHAR(255)
INSERT INTO #x VALUES (1),(3),(2),(4)
SELECT #r= STUFF(( SELECT ',' + CAST(i AS VARCHAR(max))
FROM #x
ORDER BY i
FOR XML PATH(''), type
).value('.','varchar(255)'), 1, 1, '')
SELECT #r
Solution Overview
You can use FOR XML PATH('') to achieve this, just use the following command:
SELECT '' + NAME
FROM (SELECT Top 3 NAME FROM TBL_1 ORDER BY NEWID()) AS T
FOR XML PATH('')
Or simple concatenation
SELECT #x = #x + NAME
FROM (SELECT Top 3 NAME FROM TBL_1 ORDER BY NEWID()) AS T1
Detailed Solution
SQLFiddle Demo
First i created the test environment using the following query
CREATE TABLE TBL_1 (NAME Varchar(50))
CREATE TABLE TBL_2 (NAME Varchar(50))
INSERT INTO TBL_1 (Name) VALUES ('John'),('Max'),('Louise'),('Mark'),('Peter')
Then i Used the following command
DECLARE #x varchar(255)
SELECT #x = (SELECT '' + NAME
FROM (SELECT Top 3 NAME FROM TBL_1 ORDER BY NEWID()) AS T1
FOR XML PATH('') )
INSERT INTO TBL_2(NAME) SELECT #x;
SELECT * FROM TBL_2
And the Result is JohnLouiseMax
Or you can use simple concatenation to achieve this
SQLFiddle Demo
DECLARE #x varchar(255)
SET #x = ''
SELECT #x = #x + NAME
FROM (SELECT Top 3 NAME FROM TBL_1 ORDER BY NEWID()) AS T1
INSERT INTO TBL_2(NAME) SELECT #x;
SELECT * FROM TBL_2
I want to convert rows as column (like PIVOT) and i am unable to get if the number of values increases.
Below is my table.
i want the output like this.
I have used the following queries to acheive this but no luck.
Query1
Create table #temp(instanceid int, submissionid int, name1 varchar(20), value1 varchar(20))
insert into #temp(instanceid,submissionid,name1,value1)
Select 5151,5532,'Question_1','Y'
union
Select 5151,5532,'First','Mujda'
union
Select 5151,5532,'Last','Zhublawar'
union
Select 5151,5532,'Question_1','Y'
union
Select 5151,5532,'First','Mujda1'
union
Select 5151,5532,'Last','Zhublawar1'
union
Select 5151,5532,'Question_1','Y'
union
Select 5152,5533,'First','Muthu'
union
Select 5151,5533,'Last','Kumar'
union
Select 5152,5533,'Question_1','Y'
union
Select 5152,5533,'First','Muthu1'
union
Select 5152,5533,'Last','Kumar1'
GO
DECLARE #SQLQuery AS NVARCHAR(MAX)
DECLARE #PivotColumns AS NVARCHAR(MAX)
DECLARE #PivotValues AS NVARCHAR(MAX)
--Get unique values of pivot column
SELECT #PivotColumns= COALESCE(#PivotColumns + ',','') + QUOTENAME(seq)
FROM (
select (cast(row_number() over(partition by name1 order by name1) as varchar(10)) + name1) as seq
from #temp group by value1,name1,instanceid
) AS PivotExample
--Create the dynamic query with all the values for
--pivot column at runtime
SET #SQLQuery =
N'SELECT instanceid,submissionid, ' + #PivotColumns + '
FROM #temp
PIVOT( MAX(value1)
FOR name1 IN (' + #PivotColumns + ')) AS P'
--Execute dynamic query
EXEC sp_executesql #SQLQuery
DROP TABLE #temp
Query2:
Create table #temp(instanceid int, submissionid int, name1 varchar(20), value1 varchar(20))
insert into #temp(instanceid,submissionid,name1,value1)
Select 5151,5532,'Question_1','Y'
union
Select 5151,5532,'First','Mujda'
union
Select 5151,5532,'Last','Zhublawar'
union
Select 5151,5532,'Interest','100'
select * from(
Select
instanceid,
submissionid,
[1st Ownership First Name] = Case when name1='First' then value1 end,
[1st Ownership Last Name] = Case when name1='Last' then value1 end,
[1st Ownership Question] = Case when name1='Question_1' then value1 end
from #temp
group by instanceid,submissionid,name1,value1
) P where p.[1st Ownership First Name] is not null or p.[1st Ownership Last Name] is not null or p.[1st Ownership Question] is not null
drop table #temp
You need an extra field to get some order in that data with all the duplicates.
For example a primary key.
Then you can use a pivot with a row_number that uses that extra field in the order by.
Then concat the row_number with the name1, and Pivot on those.
For example :
create table #temp (id int identity(1,1), instanceid int, submissionid int, name1 varchar(20), value1 varchar(20));
insert into #temp(instanceid,submissionid,name1,value1) values
(5151,5532,'First','Mujda'),
(5151,5532,'Last','Zhublawar'),
(5151,5532,'Question_1','Y'),
(5151,5532,'First','Mujda1'),
(5151,5532,'Last','Zhublawar1'),
(5151,5532,'Question_1','Y'),
(5151,5532,'First','Mujda1'),
(5151,5532,'Last','Zhublawar1'),
(5151,5532,'Question_1','Y'),
(5151,5533,'First','Muthu'),
(5151,5533,'Last','Kumar'),
(5151,5533,'Question_1','Y'),
(5151,5534,'First','Suresh'),
(5151,5534,'Last','Kumar'),
(5151,5534,'Question_1','Y'),
(5151,5534,'First','Suresh1'),
(5151,5534,'Last','Kumar1'),
(5151,5534,'Question_1','Y');
SELECT
instanceid,
submissionid,
[First1] as [1st First], [Last1] as [1st Last], [Question_11] as [1st Question_1],
[First2] as [2nd First], [Last2] as [2nd Last], [Question_12] as [2nd Question_1],
[First3] as [3rd First], [Last3] as [3rd Last], [Question_13] as [3rd Question_1]
FROM (
select
instanceid,
submissionid,
concat(name1, row_number() over (partition by instanceid, submissionid, name1 order by id)) as name_rn, value1
from #temp
where name1 in ('First','Last','Question_1')
) t
PIVOT( MAX(value1)
FOR name_rn IN (
[First1], [Last1], [Question_11],
[First2], [Last2], [Question_12],
[First3], [Last3], [Question_13]
)
) AS Pvt;
To do it the dynamic way, here's some SQL to generate a #SQL variable.
declare #T table (name1 varchar(20));
insert into #T select name1 from #temp group by name1 order by name1;
declare #SQL nvarchar(max);
declare #Fields1 nvarchar(max);
declare #Fields2 nvarchar(max);
SELECT #Fields2 = STUFF((select ', ' + quotename(name1) from #T order by name1 FOR XML PATH('')),1,1,'');
SET #Fields2 = replace(#Fields2,']','1]')+','+char(13)+replace(#Fields2,']','2]')+','+char(13)+replace(#Fields2,']','3]');
SELECT #Fields1 = STUFF((select ',$' + quotename(name1+n)+' as '+quotename(nx+' '+name1) from (
select '1' as n, '1st' as nx, name1 from #T union all
select '2', '2nd' as nx, name1 from #T union all
select '3', '3rd' as nx, name1 from #T
) q order by n, name1 FOR XML PATH('')),1,1,'');
SET #Fields1 = replace(#Fields1,'$',char(13));
SET #SQL =
'SELECT
instanceid,
submissionid,'+#Fields1+'
FROM (
select
instanceid,
submissionid,
concat(name1, row_number() over (partition by instanceid, submissionid, name1 order by id)) as name_rn, value1
from #temp
) t
PIVOT( MAX(value1)
FOR name_rn IN ('+char(13)+#Fields2+')
) AS Pvt';
select #SQL;
--Get unique values of pivot column
SELECT #PivotColumns= COALESCE(#PivotColumns + ',','') + QUOTENAME(seq)
FROM (
select DISTINCT (name1) as seq
from #temp group by value1,name1,instanceid
) AS PivotExample
This are is your problem you are concatenating a row_number into the name1 value which would always be null. Your column list needs to be the DISTINCT values in name1 NOT what you want them to be in the end. If you want to rename columns you would alias them after the pivot or change the value in name1 prior to running the pivot.
So in the above code I removed the ROW_NUMBER() and added DISTINCT to the derived table.
Also note the test data you included has some instanceid & submissionid combinations that are missing certain fields like first name, or question. It looks like when copying and pasting you just didn't correct the correlations.
How do I get:
id Name Value
1 A 4
1 B 8
2 C 9
to
id Column
1 A:4, B:8
2 C:9
No CURSOR, WHILE loop, or User-Defined Function needed.
Just need to be creative with FOR XML and PATH.
[Note: This solution only works on SQL 2005 and later. Original question didn't specify the version in use.]
CREATE TABLE #YourTable ([ID] INT, [Name] CHAR(1), [Value] INT)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'A',4)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'B',8)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (2,'C',9)
SELECT
[ID],
STUFF((
SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX))
FROM #YourTable
WHERE (ID = Results.ID)
FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
,1,2,'') AS NameValues
FROM #YourTable Results
GROUP BY ID
DROP TABLE #YourTable
If it is SQL Server 2017 or SQL Server Vnext, SQL Azure you can use STRING_AGG as below:
SELECT id, STRING_AGG(CONCAT(name, ':', [value]), ', ')
FROM #YourTable
GROUP BY id
using XML path will not perfectly concatenate as you might expect... it will replace "&" with "&" and will also mess with <" and ">
...maybe a few other things, not sure...but you can try this
I came across a workaround for this... you need to replace:
FOR XML PATH('')
)
with:
FOR XML PATH(''),TYPE
).value('(./text())[1]','VARCHAR(MAX)')
...or NVARCHAR(MAX) if thats what youre using.
why the hell doesn't SQL have a concatenate aggregate function? this is a PITA.
I ran into a couple of problems when I tried converting Kevin Fairchild's suggestion to work with strings containing spaces and special XML characters (&, <, >) which were encoded.
The final version of my code (which doesn't answer the original question but may be useful to someone) looks like this:
CREATE TABLE #YourTable ([ID] INT, [Name] VARCHAR(MAX), [Value] INT)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'Oranges & Lemons',4)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'1 < 2',8)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (2,'C',9)
SELECT [ID],
STUFF((
SELECT ', ' + CAST([Name] AS VARCHAR(MAX))
FROM #YourTable WHERE (ID = Results.ID)
FOR XML PATH(''),TYPE
/* Use .value to uncomment XML entities e.g. > < etc*/
).value('.','VARCHAR(MAX)')
,1,2,'') as NameValues
FROM #YourTable Results
GROUP BY ID
DROP TABLE #YourTable
Rather than using a space as a delimiter and replacing all the spaces with commas, it just pre-pends a comma and space to each value then uses STUFF to remove the first two characters.
The XML encoding is taken care of automatically by using the TYPE directive.
Another option using Sql Server 2005 and above
---- test data
declare #t table (OUTPUTID int, SCHME varchar(10), DESCR varchar(10))
insert #t select 1125439 ,'CKT','Approved'
insert #t select 1125439 ,'RENO','Approved'
insert #t select 1134691 ,'CKT','Approved'
insert #t select 1134691 ,'RENO','Approved'
insert #t select 1134691 ,'pn','Approved'
---- actual query
;with cte(outputid,combined,rn)
as
(
select outputid, SCHME + ' ('+DESCR+')', rn=ROW_NUMBER() over (PARTITION by outputid order by schme, descr)
from #t
)
,cte2(outputid,finalstatus,rn)
as
(
select OUTPUTID, convert(varchar(max),combined), 1 from cte where rn=1
union all
select cte2.outputid, convert(varchar(max),cte2.finalstatus+', '+cte.combined), cte2.rn+1
from cte2
inner join cte on cte.OUTPUTID = cte2.outputid and cte.rn=cte2.rn+1
)
select outputid, MAX(finalstatus) from cte2 group by outputid
Install the SQLCLR Aggregates from http://groupconcat.codeplex.com
Then you can write code like this to get the result you asked for:
CREATE TABLE foo
(
id INT,
name CHAR(1),
Value CHAR(1)
);
INSERT INTO dbo.foo
(id, name, Value)
VALUES (1, 'A', '4'),
(1, 'B', '8'),
(2, 'C', '9');
SELECT id,
dbo.GROUP_CONCAT(name + ':' + Value) AS [Column]
FROM dbo.foo
GROUP BY id;
Eight years later... Microsoft SQL Server vNext Database Engine has finally enhanced Transact-SQL to directly support grouped string concatenation. The Community Technical Preview version 1.0 added the STRING_AGG function and CTP 1.1 added the WITHIN GROUP clause for the STRING_AGG function.
Reference: https://msdn.microsoft.com/en-us/library/mt775028.aspx
SQL Server 2005 and later allow you to create your own custom aggregate functions, including for things like concatenation- see the sample at the bottom of the linked article.
This is just an addition to Kevin Fairchild's post (very clever by the way). I would have added it as a comment, but I don't have enough points yet :)
I was using this idea for a view I was working on, however the items I was concatinating contained spaces. So I modified the code slightly to not use spaces as delimiters.
Again thanks for the cool workaround Kevin!
CREATE TABLE #YourTable ( [ID] INT, [Name] CHAR(1), [Value] INT )
INSERT INTO #YourTable ([ID], [Name], [Value]) VALUES (1, 'A', 4)
INSERT INTO #YourTable ([ID], [Name], [Value]) VALUES (1, 'B', 8)
INSERT INTO #YourTable ([ID], [Name], [Value]) VALUES (2, 'C', 9)
SELECT [ID],
REPLACE(REPLACE(REPLACE(
(SELECT [Name] + ':' + CAST([Value] AS VARCHAR(MAX)) as A
FROM #YourTable
WHERE ( ID = Results.ID )
FOR XML PATH (''))
, '</A><A>', ', ')
,'<A>','')
,'</A>','') AS NameValues
FROM #YourTable Results
GROUP BY ID
DROP TABLE #YourTable
An example would be
In Oracle you can use LISTAGG aggregate function.
Original records
name type
------------
name1 type1
name2 type2
name2 type3
Sql
SELECT name, LISTAGG(type, '; ') WITHIN GROUP(ORDER BY name)
FROM table
GROUP BY name
Result in
name type
------------
name1 type1
name2 type2; type3
This kind of question is asked here very often, and the solution is going to depend a lot on the underlying requirements:
https://stackoverflow.com/search?q=sql+pivot
and
https://stackoverflow.com/search?q=sql+concatenate
Typically, there is no SQL-only way to do this without either dynamic sql, a user-defined function, or a cursor.
Just to add to what Cade said, this is usually a front-end display thing and should therefore be handled there. I know that sometimes it's easier to write something 100% in SQL for things like file export or other "SQL only" solutions, but most of the times this concatenation should be handled in your display layer.
Don't need a cursor... a while loop is sufficient.
------------------------------
-- Setup
------------------------------
DECLARE #Source TABLE
(
id int,
Name varchar(30),
Value int
)
DECLARE #Target TABLE
(
id int,
Result varchar(max)
)
INSERT INTO #Source(id, Name, Value) SELECT 1, 'A', 4
INSERT INTO #Source(id, Name, Value) SELECT 1, 'B', 8
INSERT INTO #Source(id, Name, Value) SELECT 2, 'C', 9
------------------------------
-- Technique
------------------------------
INSERT INTO #Target (id)
SELECT id
FROM #Source
GROUP BY id
DECLARE #id int, #Result varchar(max)
SET #id = (SELECT MIN(id) FROM #Target)
WHILE #id is not null
BEGIN
SET #Result = null
SELECT #Result =
CASE
WHEN #Result is null
THEN ''
ELSE #Result + ', '
END + s.Name + ':' + convert(varchar(30),s.Value)
FROM #Source s
WHERE id = #id
UPDATE #Target
SET Result = #Result
WHERE id = #id
SET #id = (SELECT MIN(id) FROM #Target WHERE #id < id)
END
SELECT *
FROM #Target
Let's get very simple:
SELECT stuff(
(
select ', ' + x from (SELECT 'xxx' x union select 'yyyy') tb
FOR XML PATH('')
)
, 1, 2, '')
Replace this line:
select ', ' + x from (SELECT 'xxx' x union select 'yyyy') tb
With your query.
You can improve performance significant the following way if group by contains mostly one item:
SELECT
[ID],
CASE WHEN MAX( [Name]) = MIN( [Name]) THEN
MAX( [Name]) NameValues
ELSE
STUFF((
SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX))
FROM #YourTable
WHERE (ID = Results.ID)
FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
,1,2,'') AS NameValues
END
FROM #YourTable Results
GROUP BY ID
didn't see any cross apply answers, also no need for xml extraction. Here is a slightly different version of what Kevin Fairchild wrote. It's faster and easier to use in more complex queries:
select T.ID
,MAX(X.cl) NameValues
from #YourTable T
CROSS APPLY
(select STUFF((
SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX))
FROM #YourTable
WHERE (ID = T.ID)
FOR XML PATH(''))
,1,2,'') [cl]) X
GROUP BY T.ID
Using the Stuff and for xml path operator to concatenate rows to string :Group By two columns -->
CREATE TABLE #YourTable ([ID] INT, [Name] CHAR(1), [Value] INT)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'A',4)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'B',8)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (1,'B',5)
INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (2,'C',9)
-- retrieve each unique id and name columns and concatonate the values into one column
SELECT
[ID],
STUFF((
SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX)) -- CONCATONATES EACH APPLICATION : VALUE SET
FROM #YourTable
WHERE (ID = Results.ID and Name = results.[name] )
FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
,1,2,'') AS NameValues
FROM #YourTable Results
GROUP BY ID
SELECT
[ID],[Name] , --these are acting as the group by clause
STUFF((
SELECT ', '+ CAST([Value] AS VARCHAR(MAX)) -- CONCATONATES THE VALUES FOR EACH ID NAME COMBINATION
FROM #YourTable
WHERE (ID = Results.ID and Name = results.[name] )
FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
,1,2,'') AS NameValues
FROM #YourTable Results
GROUP BY ID, name
DROP TABLE #YourTable
Using Replace Function and FOR JSON PATH
SELECT T3.DEPT, REPLACE(REPLACE(T3.ENAME,'{"ENAME":"',''),'"}','') AS ENAME_LIST
FROM (
SELECT DEPT, (SELECT ENAME AS [ENAME]
FROM EMPLOYEE T2
WHERE T2.DEPT=T1.DEPT
FOR JSON PATH,WITHOUT_ARRAY_WRAPPER) ENAME
FROM EMPLOYEE T1
GROUP BY DEPT) T3
For sample data and more ways click here
If you have clr enabled you could use the Group_Concat library from GitHub
Another example without the garbage: ",TYPE).value('(./text())[1]','VARCHAR(MAX)')"
WITH t AS (
SELECT 1 n, 1 g, 1 v
UNION ALL
SELECT 2 n, 1 g, 2 v
UNION ALL
SELECT 3 n, 2 g, 3 v
)
SELECT g
, STUFF (
(
SELECT ', ' + CAST(v AS VARCHAR(MAX))
FROM t sub_t
WHERE sub_t.g = main_t.g
FOR XML PATH('')
)
, 1, 2, ''
) cg
FROM t main_t
GROUP BY g
Input-output is
************************* -> *********************
* n * g * v * * g * cg *
* - * - * - * * - * - *
* 1 * 1 * 1 * * 1 * 1, 2 *
* 2 * 1 * 2 * * 2 * 3 *
* 3 * 2 * 3 * *********************
*************************
I used this approach which may be easier to grasp. Get a root element, then concat to choices any item with the same ID but not the 'official' name
Declare #IdxList as Table(id int, choices varchar(max),AisName varchar(255))
Insert into #IdxLIst(id,choices,AisName)
Select IdxId,''''+Max(Title)+'''',Max(Title) From [dbo].[dta_Alias]
where IdxId is not null group by IdxId
Update #IdxLIst
set choices=choices +','''+Title+''''
From #IdxLIst JOIN [dta_Alias] ON id=IdxId And Title <> AisName
where IdxId is not null
Select * from #IdxList where choices like '%,%'
For all my healthcare folks out there:
SELECT
s.NOTE_ID
,STUFF ((
SELECT
[note_text] + ' '
FROM
HNO_NOTE_TEXT s1
WHERE
(s1.NOTE_ID = s.NOTE_ID)
ORDER BY [line] ASC
FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
,
1,
2,
'') AS NOTE_TEXT_CONCATINATED
FROM
HNO_NOTE_TEXT s
GROUP BY NOTE_ID