How to Use Group by to Concatenate Strings in SQL Server

How to use GROUP BY to concatenate strings in SQL Server?

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

How to use GROUP BY to concatenate strings in MySQL?

SELECT id, GROUP_CONCAT(name SEPARATOR ' ') FROM table GROUP BY id;

https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html#function_group-concat

From the link above, GROUP_CONCAT: This function returns a string result with the concatenated non-NULL values from a group. It returns NULL if there are no non-NULL values.

How to use GROUP BY to concatenate strings while joining multiple tables?

You can specify a CTE – common table expression to store your temporary result :

with cteTbl ( CardID
            , TechName
            , problemReported ) as ( 
select j.CardID
     , p.ProblemReported
     , ( select TechnicianName
         from easy_tbltechnicianMaster
         where TechnicianID =  t.technicianID ) as TechName
from easy_tbljobcard as j 
join easy_technician as t on t.CardID = j.CardID  
left join easy_tblproblem as p  on p.CardID = t.CardID )

And then select from it and concatenate all column values with the same t.techName and t.CardID in one row with for xml path('') and after that replace the first comma , with stuff:

select t.CardID
     , t.TechName
     , stuff( ( select ', ' + ProblemReported
                from cteTbl
                where TechName = t.TechName
                order by ProblemReported
                for xml path('') ), 1, 1, '') AS ProblemReported
from cteTbl t
group by t.TechName
       , t.CardID

SQLFiddle

MS SQL - group by concat string

In sql server you can use FOR XML PATH

select  SubscriberId,
categoriesAdded=Stuff((SELECT ',' + CAST(CategoryId as VARCHAR(255)) FROM catsToAdd t1 WHERE t1.SubscriberId=@categoriesToAdd.SubscriberId
 FOR XML PATH (''))
             , 1, 1, '' )
from @categoriesToAdd as catsToAdd
GROUP BY SubscriberId

Concatenate many rows into a single text string with grouping

try this -

SELECT DISTINCT
      fileid
    , STUFF((
        SELECT N', ' + CAST([filename] AS VARCHAR(255))
        FROM tblFile f2
        WHERE f1.fileid = f2.fileid ---- string with grouping by fileid
        FOR XML PATH (''), TYPE), 1, 2, '') AS FileNameString
FROM tblFile f1

SQL Server Concatenate GROUP BY

If you are using sql server 2005+. Then you can do like this:

SELECT 
    JobsTagMap.JobID,
    STUFF
    (
        (
            SELECT 
                ',' +Title
            FROM
                Tags
            WHERE
                Tags.TagID=JobsTagMap.TagID
            FOR XML PATH('')
        )
    ,1,1,'') AS Title
FROM JobsTagMap

EDIT

Because you did not show us the table structure and the data in the different tables. It was a lite bit hard to know. So I assume that your table structure looks something like this:

CREATE TABLE JobsTagMap
(
    JobID INT,
    TagID INT
)

CREATE TABLE Tags
(
    TagID INT,
    Title VARCHAR(100)
)

With this data:

INSERT INTO JobsTagMap
VALUES(1,1),(1,2),(2,2),(2,4),(2,5)

INSERT INTO Tags
VALUES(1,'Tag1'),(2,'Tag2'),(3,'Tag2'),(4,'Tag5'),(5,'Tag9')

If you are getting that data that you are showing the JobID cannot be unique. You might have the a Job table somewhere where it is unique. If you just want to use these table that you are showing then you need to do something like this:

;WITH CTE
AS
(
    SELECT
        ROW_NUMBER() OVER(PARTITION BY JobID ORDER BY JobID) AS RowNbr,
        JobsTagMap.*
    FROM
        JobsTagMap
)
SELECT
    *,
    STUFF
    (
        (
            SELECT 
                ',' +Title
            FROM
                Tags
                JOIN JobsTagMap
                    ON Tags.TagID=JobsTagMap.TagID
            WHERE
                JobsTagMap.JobID=CTE.JobID
            FOR XML PATH('')
        )
    ,1,1,'') AS Title
FROM
    CTE
WHERE
    CTE.RowNbr=1

This will get you this result:

1   1   1   Tag1,Tag2
1   2   2   Tag2,Tag5,Tag9

So in the future always show what table structure and it data. That will give you better answers

How to concatenate text from multiple rows into a single text string in SQL Server

If you are on SQL Server 2017 or Azure, see Mathieu Renda answer.

I had a similar issue when I was trying to join two tables with one-to-many relationships. In SQL 2005 I found that XML PATH method can handle the concatenation of the rows very easily.

If there is a table called STUDENTS

SubjectID       StudentName
----------      -------------
1               Mary
1               John
1               Sam
2               Alaina
2               Edward

Result I expected was:

SubjectID       StudentName
----------      -------------
1               Mary, John, Sam
2               Alaina, Edward

I used the following T-SQL:

SELECT Main.SubjectID,
       LEFT(Main.Students,Len(Main.Students)-1) As "Students"
FROM
    (
        SELECT DISTINCT ST2.SubjectID, 
            (
                SELECT ST1.StudentName + ',' AS [text()]
                FROM dbo.Students ST1
                WHERE ST1.SubjectID = ST2.SubjectID
                ORDER BY ST1.SubjectID
                FOR XML PATH (''), TYPE
            ).value('text()[1]','nvarchar(max)') [Students]
        FROM dbo.Students ST2
    ) [Main]

You can do the same thing in a more compact way if you can concat the commas at the beginning and use substring to skip the first one so you don't need to do a sub-query:

SELECT DISTINCT ST2.SubjectID, 
    SUBSTRING(
        (
            SELECT ','+ST1.StudentName  AS [text()]
            FROM dbo.Students ST1
            WHERE ST1.SubjectID = ST2.SubjectID
            ORDER BY ST1.SubjectID
            FOR XML PATH (''), TYPE
        ).value('text()[1]','nvarchar(max)'), 2, 1000) [Students]
FROM dbo.Students ST2

Group by in SQL Server and concatenate records in one column

You can use STUFF and GROUP BY with MIN,MAX,SUM aggregation as below and in your example paid amount is in 5 digit and amount in 6 digit so it can't be zero in balance. In my example I made 6 digits paid amount to match with your expected result but you should correct and use it as needed

DECLARE @sales TABLE(company VARCHAR(50), 
    ref INT, 
    Tag INT, 
    event_date DATE, 
    sale_price INT, 
    Amount  INT,  
    Receipt_No VARCHAR(50), 
    Paid INT, 
    Balance INT)

INSERT INTO @sales VALUES
('PRco Ltd',123,0311,'03-10-2018',610000,610000,'R19A0000761',500000,11000),
('PRco Ltd',123,0311,'03-10-2018',610000,610000,'R19A0000912',110000,0)

SELECT s.company, 
    s.ref, 
    s.Tag, 
    s.event_date,
    MAX(s.sale_price) sale_price,
    MAX(s.amount) amount,
    MAX(s1.receipt) receipt,
    SUM(s.paid) paid,
    (MAX(s.amount)-SUM(s.paid)) balance
FROM @sales s
OUTER APPLY (
            select stuff(
                (select ',' + s1.Receipt_No 
                from @sales s1
                where s1.company = s.company
                AND s1.ref = s.ref
                AND s1.Tag = s.Tag
                AND s1.event_date = s.event_date
                for xml path('')
                )
            , 1, 1, '') receipt
        ) s1
GROUP BY s.company, s.ref, s.Tag, s.event_date

OUTPUT:

company     ref Tag event_date  sale_price  amount  receipt                 paid    balance
PRco Ltd    123 311 2018-03-10  610000      610000  R19A0000761,R19A0000912 610000  0

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