Solved

if value is already in the second table do not select

Posted on 2013-12-19
2
209 Views
Last Modified: 2013-12-20
profile_id is varchar

SELECT profile_id
            FROM a_messages
            WHERE

where profile_id is NOT in profiles
so profiles.profile_id does not exist

because if the value is already profiles table, there is no need to use it
0
Comment
Question by:rgb192
2 Comments
 
LVL 8

Accepted Solution

by:
vr6r earned 500 total points
ID: 39730381
SELECT a_messages.profile_id
FROM a_messages
LEFT JOIN profiles on profiles.profile_id = a_messages.profile_id
WHERE profiles.profile_id IS NULL

Open in new window

0
 

Author Closing Comment

by:rgb192
ID: 39733166
thank you
0

Featured Post

The Eight Noble Truths of Backup and Recovery

How can IT departments tackle the challenges of a Big Data world? This white paper provides a roadmap to success and helps companies ensure that all their data is safe and secure, no matter if it resides on-premise with physical or virtual machines or in the cloud.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Trigger usage 2 75
Problem with Simple PHP/mySQL Query 3 76
running code or pseudo code of table structure 5 31
MySQL Memory Keeps Increasing 4 47
All XML, All the Time; More Fun MySQL Tidbits – Dynamically Generate XML via Stored Procedure in MySQL Extensible Markup Language (XML) and database systems, a marriage we are seeing more and more of.  So the topics of parsing and manipulating XM…
When table data gets too large to manage or queries take too long to execute the solution is often to buy bigger hardware or assign more CPUs and memory resources to the machine to solve the problem. However, the best, cheapest and most effective so…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

828 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