Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

SQL Join query

Posted on 2008-10-26
6
237 Views
Last Modified: 2012-05-05
How do i get the required result from querying the two tables.

tblGroups
Group      R      Folder3
Group      RW      Folder1
Group      R      Folder2
Group      RW      Folder4
Group     R      Folder5

tblFolders
Folder      R      Folder2
Folder      R      Folder1
Folder     RW   Folder5

Result:
Group      R      Folder3
Group      RW      Folder4
Folder      R      Folder2
Folder      R      Folder1
Folder     RW   Folder5
0
Comment
Question by:byte1
  • 4
  • 2
6 Comments
 
LVL 59

Accepted Solution

by:
Kevin Cross earned 500 total points
ID: 22807664
If I am understanding you correctly you want:
+All values of folders table
+Values from groups table where folder name is not preset in folders table

SELECT *
FROM tblFolders
UNION ALL
SELECT *
FROM tblGroups g
WHERE NOT EXISTS (SELECT 1 FROM tblFolders f WHERE f.FolderNameColumn = g.FolderNameColumn)

Open in new window

0
 

Author Comment

by:byte1
ID: 22807684
I need values from both tables but Folder table takes precedence. if a row exists in tblgroups and tblfolders ,tblFolders takes precedence.
0
 
LVL 59

Expert Comment

by:Kevin Cross
ID: 22807702
The above should do the trick as that is the same principal as you will get all values of tblFolders first and then only the values that are not in tblFolders which will give you all values of both tables with the common values labelled as Folder instead of Group.
0
DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

 
LVL 59

Expert Comment

by:Kevin Cross
ID: 22807711
The above was for simplicity sake, you may want to type out the column names and alias them how you want to show in the report since you are combining tables the predefined column names may not make sense after UNION.


SELECT Col1 AS FolderType, Col2 AS FolderRights, FolderNameColumn AS FolderName
FROM tblFolders
UNION ALL
SELECT Col1, Col2, FolderNameColumn
FROM tblGroups g
WHERE NOT EXISTS (SELECT 1 FROM tblFolders f WHERE f.FolderNameColumn = g.FolderNameColumn)

Open in new window

0
 

Author Comment

by:byte1
ID: 22807716
Sorry i did not include column names, my bad. Thanks for the solution it worked like a charm.
0
 
LVL 59

Expert Comment

by:Kevin Cross
ID: 22807723
Glad to help and no worries.
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

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

Suggested Solutions

PL/SQL can be a very powerful tool for working directly with database tables. Being able to loop will allow you to perform more complex operations, but can be a little tricky to write correctly. This article will provide examples of basic loops alon…
If you have heard of RFC822 date formats, they can be quite a challenge in SQL Server. RFC822 is an Internet standard format for email message headers, including all dates within those headers. The RFC822 protocols are available in detail at:   ht…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

809 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