How can I get distinct values in COALESCE()

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I have table values in this format

sam
jack
sam
john

Declare @name varchar(max)
select @name = COALESCE(@name + ', ','')+ user_email 
from   PostedCommentMaster where article_id = @id

How can I get distinct value

sam,jack,john

like this.

You can wrap the select statement into a subselect and apply coalesce on the results.

Declare @name varchar(max) 

select @name = COALESCE(@name + ', ','') + user_email 
from   (select distinct user_email 
        from   PostedCommentMaster 
        where article_id = @id) pc

Note that this uses an undocumented feature of SQL Server to concatenate the results into one string. While I can't find a link to it anymore, I recall reading that your should not rely on this behavior.

A better alternative would be to use the FOR XML syntax to return a concatenated string. A search on SO returns multiple results you can use as an example.

Using DISTINCT and COALESCE together? - Databases, state char(1)); INSERT @t(area,city,state) VALUES (1,'a','a'),(2,'a','a'),(3,'b' There is certainly a way to do this with STRING_AGG() in more  You must make sure your inner query join with a value of the outer query, otherwise they won't be related. Something like this: SELECT DISTINCT @Staging_Off= COALESCE(@Staging_Off + ',', '')+ Offering FROM xyz AS X1 WHERE X1.Offering NOT IN ( SELECT DISTINCT O.Offering FROM Offering AS O, xyz AS X2 WHERE O.Offering = X2.Offering AND X2.SomeId

Here you go

Declare @name varchar(max) 
select 
    @name = COALESCE(@name + ', ','')+name from (select distinct user_email 
from 
    PostedCommentMaster) as t
where 
    article_id = @id

How to use COALESCE with DISTINCT with multiple rows and , If you want comma separated values from columns it is so simple. Use COALESCE function provided by SQL Server. DECLARE @csv  Since the DISTINCT keyword works on a complete record, we need to write conditions "x <30" and "x>=30" separately in CASE WHEN. The COALESCE function tells SAS to replace missing values with 0 and then sum the returned values of both the conditions.

You can use group by for unique values.

Declare @name varchar(max)
select @name = COALESCE(@name + ', ','')+ user_email 
from   PostedCommentMaster where article_id = @id 
group by user_email

COALESCE with DISTINCT in SQLServer, SQL statement can be rewritten using the CASE statement. in fact, there’s only one way, which is to place the DISTINCT keyword right after the SELECT keyword I tried this and it didn’t work… // FORMER QUERY $q8 = "SELECT

Best You can use this one.

Declare @name varchar(max)
select @name = COALESCE(@name + ', ','')+ user_email  from (select distinct user_email 
from   PostedCommentMaster where article_id = @id ) as tblTemp

SQL Server: COALESCE Function, () function returns the first non-null value in a list. How to get a list of unique and distinct values in Excel by Svetlana Cheusheva | updated on May 6, 2020 104 Comments This is the final part of the Excel Unique Values series that shows how to get a list of distinct / unique values in column using a formula, and how to tweak that formula for different datasets.

SELECT distinct @name = COALESCE(@name + ', ','')+ user_email from PostedCommentMaster where article_id = @id

Using the SQL Coalesce function in SQL Server, The COALESCE() function returns the first non-null value in a list. Syntax. COALESCE(val1, val2, ., val_n). Parameter Values. Parameter, Description. You can wrap the select statement into a subselect and apply coalesce on the results. Declare @name varchar(max) select @name = COALESCE(@name + ', ','') + user_email from (select distinct user_email from PostedCommentMaster where article_id = @id) pc

SQL Server COALESCE() Function, The above program computes number of distinct values in variable 'y' when values of variable coalesce(sum(distinct case when x < 30 then y end),0) + In this case, the RANUNI() function makes Y as unique identifier so that we can later​  The normal distinct not so user friendly, because you cant set the column. In this case enough for you: df = df.distinct() but if you have other value in date column, you wont get back the distinct elements from host:

Is Coalesce a function of ANSI SQL, It allows handling the behavior of the NULL value. So, in this case, use the coalesce SQL function to replace any middle name NULL values with  SELECT dist.Column + ',' FROM( SELECT DISTINCT t.Column FROM dbo.tb t) dist FOR XML PATH ('') By this u will get unique values. But at the end you will extra comma ',' you can remove it by string functions. Hope this works

SAS SQL : Use Distinct in CASE WHEN, I want to know how to coalesce distinct values as comma seperated into a variable which is used elsewhere. Here are my ddl and the query I  This result is in compliance with the SQL standard. In either case, different results can be returned between the first evaluation and upcoming evaluations. For example, when the code COALESCE((subquery), 1) is executed, the subquery is evaluated twice. As a result, you can get different results depending on the isolation level of the query.

Comments
  • Why are you using COALESCE here? You first declare the @name variable, then immediately check to see whether it is null. It will always be null, as it will never get set to anything
  • @paul - This is one (undocumented) way to concatenate a column from a resultset.
  • I see, so @name is actually re-evaluated per row returned. clever.
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