Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Deal with null value when using group_concat in mysql

Posted on 2010-09-15
3
Medium Priority
?
509 Views
Last Modified: 2012-05-10
I have the following query in mysql views:

select distinct `tblApplications`.`fldApplicationID` AS `fldApplicationID`,`tblLotonPlan`.`fldLotonPlanID` AS `fldLotonPlanID`,
group_concat(_latin1' ',`tblEntity`.`fldName`,' ',`tblEntity`.`fldSurname`,_latin1' ' separator ',') AS `Owners`
from (((`tbl_Lnk_Applications`
join `tblLotonPlan` on`tbl_Lnk_Applications`.`fldApplicationLinkID` = `tblLotonPlan`.`fldApplicationLinkID`)
join `tblApplications` on`tblApplications`.`fldApplicationID` = `tbl_Lnk_Applications`.`fldApplicationID`)
join `tblLandowner` on `tblLandowner`.`fldLotonPlanID` = `tblLotonPlan`.`fldLotonPlanID`)
join `tblEntity` on`tblEntity`.`fldEntityID` = `tblLandowner`.`fldEntityID`
group by `tblLotonPlan`.`fldLotonPlanID`

The main issue is the field

group_concat(_latin1' ',`tblEntity`.`fldName`,' ',`tblEntity`.`fldSurname`,_latin1' ' separator ',') AS `Owners


This fields return a null value when `tblEntity`.`fldSurname` is null such as in the case of a business name.


I have tried using


group_concat(_latin1' ',`tblEntity`.`fldName`,' ',IFNULL(`tblEntity`.`fldSurname`,""),_latin1' ' separator ',') AS `Owners

Problem with this approach is that it repeats an instant of the name for each space in the name. For example:
Expert Exchange Forum will return
Expert Exchange Forum,Expert Exchange Forum,Expert Exchange Forum

How do I deal with this

0
Comment
Question by:Sheils
  • 2
3 Comments
 
LVL 6

Accepted Solution

by:
DalHorinek earned 2000 total points
ID: 33680353
The problem is that group_concat just takes all occurences and concats them.

Try to add DISTINCT

group_concat(DISTINCT _latin1' ',`tblEntity`.`fldName`,' ',`tblEntity`.`fldSurname`,_latin1' ' separator ',') AS `Owners

Open in new window

0
 
LVL 16

Author Comment

by:Sheils
ID: 33680442
Hi Dal

I will try this out at work tomorrow and get back to you.

0
 
LVL 16

Author Closing Comment

by:Sheils
ID: 33699186
yes that did the trick. Thanks Mate
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

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

In this article, we’ll look at how to deploy ProxySQL.
Windows Explorer let you handle zip folders nearly as any other folder: Copy, move, change, and delete, etc. In VBA you can also handle normal files and folders, but zip folders takes a little more - and that you'll find here.
Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…
Have you created a query with information for a calendar? ... and then, abra-cadabra, the calendar is done?! I am going to show you how to make that happen. Visualize your data!  ... really see it To use the code to create a calendar from a q…
Suggested Courses

926 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