Solved

Oracle Query help: I want to be able to identify the values in TableA that are NOT located in TableB

Posted on 2011-03-01
4
403 Views
Last Modified: 2012-08-14
Question: What query can I use for this? This is for an oracle database, and I'm using PL/SQL.
I want to be able to identify the values in TableA that are NOT located in TableB

TableA

FirstName            LastName
David            Smith
Mike            Smith
Arron            Smith


TableB

FirstName            LastName
Mark            Smith
Mike            Smith
Arron            Smith
Bubba        Smith


So after I run my query, it will return...
David            Smith
0
Comment
Question by:silentthread2k
  • 2
  • 2
4 Comments
 
LVL 76

Expert Comment

by:slightwv (䄆 Netminder)
ID: 35011036
select * from tableA
minus
select * from tableB;
0
 
LVL 76

Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points
ID: 35011044
or specify the columns:

select firstname,lastname from tableA
minus
select firstname,lastname from tableB;
0
 
LVL 73

Expert Comment

by:sdstuber
ID: 35011052
if there are other columns that you want to use but aren't shown in your example

select * from tableA
where (first_name,last_name) not in (select first_name,last_name from tableB)

I'm assuming the name columns are not null
0
 
LVL 73

Expert Comment

by:sdstuber
ID: 35011069
if there might be nulls try NOT EXISTS,  modify the subquery where clause based on how you want to evaluate NULL comparisons (if at all)


select * from tableA
where not exists (select null from tableB where tablea.last_name=tableb.last_name and tableb.first_name=tablea.first_name)
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

SQL Command Tool comes with APEX under SQL Workshop. It helps us to make changes on the database directly using a graphical user interface. This helps us writing any SQL/ PLSQL queries and execute it on the database and we can create any database ob…
This article explains all about SQL Server Piecemeal Restore with examples in step by step manner.
Via a live example, show how to take different types of Oracle backups using RMAN.
This video explains what a user managed backup is and shows how to take one, providing a couple of simple example scripts.

831 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