Oracle外部联接声明

Question

I have two tables:

Module Table

• ModuleID
• ModuleData
• ModuleSectionID

UserProfile Table

• UserProfileID
• UserID
• ModuleID

I need to join the two tables together, but the UserProfile table won't necessary be present for each Module entry. I will be passed the two variables ModuleSectionID, and UserID. These will help narrow down results in the final set.

The desired result should something like this

M.ModuleID, M.ModuleData, M.ModuleSection, U.UserProfileID, U.UserID, U.ModuleID
---------------------------------------------------------------------------------
13         "DataData"     3                1                132       13
12         "Data2Data2"   3                Null             Null      Null
15         "Data3Data3"   3                3                132       15

Answer 1

Use:

   SELECT m.moduleid,
          m.moduledata,
          m.modulesection,
          up.upserprofileid,
          up.userid, 
          up.moduleid
     FROM MODULE m
LEFT JOIN USERPROFILE up ON up.moduleid = m.moduleid
                        AND up.userid = IN_USERID
    WHERE m.modulesection = IN_MODULESECTIONID

The IN_USERID and IN_MODULESECTIONID represent the variables you want to supply to the query.

Answer 2

Try this:

SELECT M.ModuleID, M.ModuleData, M.ModuleSectionID, U.UserProfileID, U.UserID, U.ModuleID
    FROM Module m, UserProfile u 
 WHERE M.ModuleSctionID = <MODULE_SECTIONID_PARAMETER>
 AND M.ModuleID = U.ModuleID(+)
 AND <USER_ID_PARAMETER> = U.UserID (+)