Solved

select varchar fields in table1 that are not in table2

Posted on 2013-11-16
2
383 Views
Last Modified: 2013-11-17
CREATE TABLE `saved_searches` (
  `savedSearchesID` bigint(20) unsigned NOT NULL auto_increment,
  `savedSearchesDefaultUsername` varchar(50) default NULL,
  PRIMARY KEY  (`savedSearchesID`)
);

 CREATE TABLE `a_messages` (
  `a_messages_id` int(11) NOT NULL auto_increment,
  `profile_id` varchar(20) default NULL,
  `message_id` bigint(20) default NULL,
  `this_user` varchar(20) default NULL,
  PRIMARY KEY  (`a_messages_id`),
  UNIQUE KEY `unique_message_id` (`message_id`)
) ENGINE=MyISAM AUTO_INCREMENT=51 DEFAULT CHARSET=utf8;

saved_searches.savedSearchesDefaultUsername is the same as a_messages.profile_id
want to select all the
saved_searches.savedSearchesDefaultUsername
that are not yet in
a_messages.profile_id

sample data
saved_searches.savedSearchesDefaultUsername
bob
sarah
susan

 a_messages.profile_id
bob

so only select
sarah and susan
0
Comment
Question by:rgb192
[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
2 Comments
 
LVL 11

Accepted Solution

by:
Amar Bardoliwala earned 500 total points
ID: 39654389
Hello rgb192,

You can write your query as following

SELECT saved_searches.savedSearchesDefaultUsername
FROM saved_searches
WHERE NOT
EXISTS (

SELECT 1
FROM a_messages
WHERE a_messages.profile_id = saved_searches.savedSearchesDefaultUsername
)

Open in new window


Hope, this will help you.

Thank you.

Amar Bardoli wala
0
 

Author Closing Comment

by:rgb192
ID: 39654968
thanks
0

Featured Post

Major Incident Management Communications

Major incidents and IT service outages cost companies millions. Often the solution to minimizing damage is automated communication. Find out more in our Major Incident Management Communications infographic.

Question has a verified solution.

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

Foreword This is an old article.  Instead of using the MySQL extension that was used in the original code examples, please choose one of the currently supported database extensions instead.  More information is available here: MySQLi / PDO (http://…
This article shows the steps required to install WordPress on Azure. Web Apps, Mobile Apps, API Apps, or Functions, in Azure all these run in an App Service plan. WordPress is no exception and requires an App Service Plan and Database to install

732 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