Help w/ selecting data in multiple tables

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June 4th, 2004, 11:49 PM

shanewho

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Help w/ selecting data in multiple tables

I have 5 tables in a database(below).
Each User is in a group, each group has a set of permissible operations. If I have a UserID, how can I get a list of permissible "OperationName"s?

Code:

GroupAssign
+---------+--------+
| GroupID | UserID |
+---------+--------+
|       1 |      1 |
|       2 |      1 |
|       2 |      2 |
+---------+--------+

GroupInfo
+---------+-----------+
| GroupID | GroupName |
+---------+-----------+
|       1 | Student   |
|       2 | Teacher   |
+---------+-----------+

OperationAssign
+---------+-------------+
| GroupID | OperationID |
+---------+-------------+
|       2 |           2 |
|       2 |           1 |
|       1 |           1 |
+---------+-------------+

OperationInfo
+-------------+---------------+
| OperationID | OperationName |
+-------------+---------------+
|           1 | View 	      |
|           2 | Edit          |
+-------------+---------------+

UserInfo
+--------+----------+
| UserID | UserName |
+--------+-----------
|      1 |     Sean |
|      2 |	Bob |
+--------+----------+

June 5th, 2004, 06:10 PM

r937

SQL Consultant

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Join Date: Feb 2003

Location: Toronto Canada

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it's a straightforward join

Code:

select GA.UserID
     , GA.GroupID
     , OA.OperationID
     , OI.OperationName
  from GroupAssign GA
inner
  join OperationAssign OA
    on GA.GroupID = OA.GroupID
inner
  join OperationInfo OI
    on OA.OperationID = OI.OperationID
order 
    by GA.UserID
     , GA.GroupID

UserID,GroupID,OperationID,OperationName
1,1,1,View
1,2,1,View
1,2,2,Edit
2,2,2,Edit
2,2,1,View

obviously, this data shows that a user can belong to more than one group, and a group can have more than one operation

thus, we need DISTINCT as well

for a specific UserID, add a WHERE clause

Code:

select distinct
       GA.UserID
     , OI.OperationName
  from GroupAssign GA
inner
  join OperationAssign OA
    on GA.GroupID = OA.GroupID
inner
  join OperationInfo OI
    on OA.OperationID = OI.OperationID
 where GA.UserID = 1
order 
    by GA.UserID
     , OI.OperationName
     
UserID,OperationName
1,Edit
1,View

__________________
r937.com | rudy.ca

June 5th, 2004, 11:45 PM

shanewho

Registered User

Join Date: May 2003

Posts: 15

Time spent in forums: 46 m 7 sec
Reputation Power: 0

Thanks

Thats perfect. Thanks a lot for the help.

Shane Blazek

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