?
Solved

How to select records that are in one database but not the other

Posted on 2008-06-09
3
Medium Priority
?
172 Views
Last Modified: 2010-03-20
I have two tables with some data. They each share a common characteristic (a customer id field).
I would like to create a SQL statement that would select everything from table A that is not in table B.
For example if table A has the id's 1,2,3,4 and table B has the values of 1,4; I only want to get rows 2 and 3
from table A out of the query. I have looked at an inner join but it seems to only do the opposite of what I want...
How do I get distinct records from table A that are NOT in table B?
Thank's in advance.
0
Comment
Question by:jpwallen
[X]
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
3 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 1000 total points
ID: 21746619
it will be a variant of the LEFT OUTER JOIN. the trick is the WHERE clause:
SELECT a.*
  FROM tableA a
  LEFT OUTER JOIN tableB b
    ON a.id = b.id
 WHERE b.id IS NULL

Open in new window

0
 
LVL 4

Expert Comment

by:albuitra
ID: 21746620
select * from table A where not exists (select b.* from b where a.field = b.field )
0
 
LVL 2

Expert Comment

by:knowledge_riot
ID: 21749363
You could also try:

SELECT DISTINCT CustomerId from TableA where CustomerId not in (SELECT CustomerId from TableB)
0

Featured Post

Get real performance insights from real users

Key features:
- Total Pages Views and Load times
- Top Pages Viewed and Load Times
- Real Time Site Page Build Performance
- Users’ Browser and Platform Performance
- Geographic User Breakdown
- And more

Question has a verified solution.

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

Microsoft Access is a place to store data within tables and represent this stored data using multiple database objects such as in form of macros, forms, reports, etc. After a MS Access database is created there is need to improve the performance and…
This post looks at MongoDB and MySQL, and covers high-level MongoDB strengths, weaknesses, features, and uses from the perspective of an SQL user.
Viewers will learn how the fundamental information of how to create a table.
Viewers will learn how to use the SELECT statement in SQL to return specific rows and columns, with various degrees of sorting and limits in place.
Suggested Courses

765 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