Solved

MS SQL join, include all in table 1 and show null when table 2..

Posted on 2013-01-07
7
302 Views
Last Modified: 2013-01-07
MS SQL to include all users and include null when no assigned taskdetail and value when there is a task detail. See below;

Users
User_ID   name
1               Joe
2               Mary
3               James
4               Mathew
5               Sam


TaskDetail
TaskDetail_ID  FK_User_ID  FK_TaskName_ID

1                          1            2
2                          4            1
3                          3            2
4                          1            3
5                            1                1
6                            1                5

I want to have all users returned for a specific task whether they are assigned to it or not.

Result for when FK_TaskName_ID = 2 should result as follows

Name             FK_User_ID        FK_TaskName_ID
Joe                          1                  2
Mary                  2                  null
James                  3                  2
Mathew                  4                  null                  
Sam                          5                  null
0
Comment
Question by:petel2k
  • 3
  • 3
7 Comments
 
LVL 65

Expert Comment

by:Jim Horn
ID: 38751038
Two things:

(1)  That would be a LEFT JOIN, which means 'return all rows in the table LEFT of the join, and include only values from the right of the LEFT join where they exist.

(2)  >I want to have all users returned for a specific task...
The below CASE block handles that, although I'm sure you'll want to change the hard-coded 2 to include a @variable, or however you're determining the FK_TaskName_ID value.

SELECT users.Name, TaskDetail.FK_User_ID, CASE WHEN TaskDetail.FK_TaskName_ID = 2 THEN 2 ELSE NULL END as FK_TaskName_ID
FROM users
LEFT JOIN TaskDetail ON users.user_id = TaskDetail.FK_USER_ID
0
 

Author Comment

by:petel2k
ID: 38751082
error
Msg 102, Level 15, State 1, Line 3
Incorrect syntax near '.'.

'FROM users'
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 38751144
Check the spelling of all table and column names to make sure they match.
The T-SQL I posted looks correct as far as syntax.
0
Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

 
LVL 12

Accepted Solution

by:
sachitjain earned 500 total points
ID: 38751148
select U.Name, T.FK_User_Id, T.FK_TaskName_ID
from Users U left join TaskDetail T on U.UserId = T.FK_User_Id and T.FK_TaskName_ID = 2
0
 

Author Closing Comment

by:petel2k
ID: 38751173
Great job!!! Thanks for the help
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 38751369
How's that answer different from the one I posted earlier?  Just curious.
The CASE block does the same as the WHERE.
0
 

Author Comment

by:petel2k
ID: 38751384
Hey Jim..

In your case, your also worked. And I misspelled. Both solutions worked. I need to modify award as a split. Sorry.
0

Featured Post

Enabling OSINT in Activity Based Intelligence

Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

Join & Write a Comment

Let's review the features of new SQL Server 2012 (Denali CTP3). It listed as below: PERCENT_RANK(): PERCENT_RANK() function will returns the percentage value of rank of the values among its group. PERCENT_RANK() function value always in be…
Everyone has problem when going to load data into Data warehouse (EDW). They all need to confirm that data quality is good but they don't no how to proceed. Microsoft has provided new task within SSIS 2008 called "Data Profiler Task". It solve th…
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…
Via a live example, show how to shrink a transaction log file down to a reasonable size.

706 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

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now