Solved

using COALESCE to combine multiple columns into a single column.

Posted on 2014-01-09
2
322 Views
Last Modified: 2014-01-09
I have a very large query that currently contains many subqueries. One of my subqueries returns several rows. I want to take each row and combine it into one column. I also want to grab several columns per row and combine them. So I'm looking for my data to appear in the columns like this. The current query below is what I was going to use if I put the data in its own table, but then I found the command COALESCE and wondered how I could accomplish what I want without creating a new table. ec.OWNER = '' would have an owner from the main query to tie together.

CAR,MODEL,DATE_ACQUIRED,YEARSACQUIRED |CAR,MODEL,DATE_ACQUIRED,YEARSACQUIRED |
CAR,MODEL,DATE_ACQUIRED,YEARSACQUIRED

select ec.CAR, ec.MODEL, ec.DATE_ACQUIRED,
(select DATEDIFF(YEAR,max(DATE_ACQUIRED),GETDATE()) from PROD.dbo.EMPCODES where CAR=ec.CAR AND TYPE='CE' and EMP_APP = 0 and MODEL=ec.MODEL) AS YEARSACQUIRED
from PROD.dbo.EMPCODES ec where TYPE='CE' and EMP_APP = 0 and MODEL in ('TY','FD', 'AU', 'CV')
and ec.OWNER = '')

Open in new window

0
Comment
Question by:NickMalloy
  • 2
2 Comments
 
LVL 26

Expert Comment

by:Shaun Kline
ID: 39768605
COALESCE is an expanded version of ISNULL. What you describe can be done using the STUFF command with XML, if you are running on a server that is SQL 2005 and greater.
0
 
LVL 26

Accepted Solution

by:
Shaun Kline earned 500 total points
ID: 39768611
Here is a working example of the STUFF command:
declare @Test TABLE
(
    ID int identity(1,1),
    Field1 varchar(10),
    Field2 varchar(10)
)

insert into @Test (field1, field2)
values ('AAA', 'Bob')

insert into @Test (field1, field2)
values ('AAA', 'John')

insert into @Test (field1, field2)
values ('AAA', 'Frank')

insert into @Test (field1, field2)
values ('BBB', 'Jan')

insert into @Test (field1, field2)
values ('BBB', 'Cat')

insert into @Test (field1, field2)
values ('BBB', 'Dana')

insert into @Test (field1, field2)
values ('CCC', 'London')

insert into @Test (field1, field2)
values ('CCC', 'New York')

insert into @Test (field1, field2)
values ('CCC', 'Paris')

SELECT field1, STUFF((SELECT ',' + Field2 FROM @Test a where a.field1 = b.field1 ORDER BY Field1 FOR XML PATH('')), 1, 1, '')
from @Test b
group by field1

Open in new window

0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction In my previous article (http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SSIS/A_9150-Loading-XML-Using-SSIS.html) I showed you how the XML Source component can be used to load XML files into a SQL Server database, us…
This article shows gives you an overview on SQL Server 2016 row level security. You will also get to know the usages of row-level-security and how it works
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
Familiarize people with the process of retrieving data from SQL Server using an Access pass-thru query. Microsoft Access is a very powerful client/server development tool. One of the ways that you can retrieve data from a SQL Server is by using a pa…

837 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question