Comma Separated List in SQL

Comma separated results in SQL

Update (As suggested by @Aaron in the comment)

STRING_AGG is the preferred way of doing this in the modern versions of SQL Server (2017 or later). It also supports easy ordering.

SELECT
    STUDENTNUMBER
    , STRING_AGG(INSTITUTIONNAME, ', ') AS StringAggList
    , STRING_AGG(INSTITUTIONNAME, ', ') WITHIN GROUP (ORDER BY INSTITUTIONNAME DESC) AS StringAggListDesc
FROM Education E
GROUP BY E.STUDENTNUMBER;

Original Answer:

Use FOR XML PATH('') - which is converting the entries to a comma separated string and STUFF() -which is to trim the first comma- as follows Which gives you the same comma separated result

SELECT
    STUFF((SELECT ',' + INSTITUTIONNAME
              FROM EDUCATION EE
              WHERE  EE.STUDENTNUMBER = E.STUDENTNUMBER
              ORDER BY sortOrder
              FOR XML PATH(''), TYPE).value('text()[1]', 'nvarchar(max)')
        , 1, LEN(','), '') AS XmlPathList
FROM EDUCATION E
GROUP BY E.STUDENTNUMBER

Here is the FIDDLE showing results for both STRING_AGG and FOR XML PATH('').

How do I create a comma-separated list using a SQL query?

There is no way to do it in a DB-agnostic way.
So you need to get the whole data-set like this:

select 
  r.name as ResName, 
  a.name as AppName
from 
  Resouces as r, 
  Applications as a, 
  ApplicationsResources as ar
where
  ar.app_id = a.id 
  and ar.resource_id = r.id

And then concat the AppName programmatically while grouping by ResName.

Multiple rows to one comma-separated value in Sql Server

Test Data

DECLARE @Table1 TABLE(ID INT, Value INT)
INSERT INTO @Table1 VALUES (1,100),(1,200),(1,300),(1,400)

Query

SELECT  ID
       ,STUFF((SELECT ', ' + CAST(Value AS VARCHAR(10)) [text()]
         FROM @Table1 
         WHERE ID = t.ID
         FOR XML PATH(''), TYPE)
        .value('.','NVARCHAR(MAX)'),1,2,' ') List_Output
FROM @Table1 t
GROUP BY ID

Result Set

╔════╦═════════════════════╗
║ ID ║     List_Output     ║
╠════╬═════════════════════╣
║  1 ║  100, 200, 300, 400 ║
╚════╩═════════════════════╝

SQL Server 2017 and Later Versions

If you are working on SQL Server 2017 or later versions, you can use built-in SQL Server Function STRING_AGG to create the comma delimited list:

DECLARE @Table1 TABLE(ID INT, Value INT);
INSERT INTO @Table1 VALUES (1,100),(1,200),(1,300),(1,400);

SELECT ID , STRING_AGG([Value], ', ') AS List_Output
FROM @Table1
GROUP BY ID;

Result Set

╔════╦═════════════════════╗
║ ID ║     List_Output     ║
╠════╬═════════════════════╣
║  1 ║  100, 200, 300, 400 ║
╚════╩═════════════════════╝

SQL Server - join rows into comma separated list

You are missing the condition inside the sub query.

SELECT t2.Id, STUFF((SELECT ',' + CAST(VALUE AS varchar) FROM @MyTable t1  where t1.Id =t2.ID FOR XML PATH('')), 1 ,1, '') AS ValueList
FROM @MyTable t2
GROUP BY t2.Id

Demo

comma delimited list as a single string, T-SQL

You could use FOR XML PATH and STUFF to concatenate the multiple rows into a single row:

select distinct t1.id,
  STUFF(
         (SELECT ', ' + convert(varchar(10), t2.date, 120)
          FROM yourtable t2
          where t1.id = t2.id
          FOR XML PATH (''))
          , 1, 1, '')  AS date
from yourtable t1;

See SQL Fiddle with Demo

Where IN a Comma delimited string

Create some split string function and convert the comma separated values to rows then you can use the converted rows IN clause

DECLARE @List VARCHAR(max)

SELECT @List = COALESCE(@List + ',', '') +StaffCode
FROM   tblStaffs

SELECT UserName
FROM   #temptable
WHERE  #temptable.StaffCode IN (SELECT split_values
                                FROM   dbo.Splitstring_function(@list)) 

Check here for various Split String function

If you dont want to create functions then you can also directly use the code instead of creating a new function(M.Ali's answer).

Another way of doing it is using dynamic query.

Declare @List varchar(max), @sql nvarchar(max)

Select @List = coalesce(@List + ',','') + '''' + StaffCode + ''''
From tblStaffs

set @sql = '
Select UserName
From #temptable
Where #temptable.StaffCode IN ('+ @List + ')'

--print @sql
exec (@sql)

To debug the dynamic query always print the dynamic sql before executing.

How to run select query on columns having comma separated values

Use the operator LIKE:

SELECT USER 
FROM DETAILS 
WHERE ',' || DEPARTMENT || ',' LIKE '%,' || 'Admin' || ',%'
  AND ',' || DEPARTMENT || ',' LIKE '%,' || 'Finance' || ',%'
  AND ',' || DEPARTMENT || ',' NOT LIKE '%,' || 'Accounts' || ',%';

Or the function INSTR():

SELECT USER 
FROM DETAILS 
WHERE INSTR(',' || DEPARTMENT || ',', ',' || 'Admin' || ',') > 0
  AND INSTR(',' || DEPARTMENT || ',', ',' || 'Finance' || ',') > 0
  AND INSTR(',' || DEPARTMENT || ',', ',' || 'Accounts' || ',') = 0;

This will work if there are no spaces after each comma in the column DEPARTMENT.

See the demo.

---

Related Topics