dcsimg
Login | Register   
LinkedIn
Google+
Twitter
RSS Feed
Download our iPhone app
TODAY'S HEADLINES  |   ARTICLE ARCHIVE  |   FORUMS  |   TIP BANK
Browse DevX
Sign up for e-mail newsletters from DevX

By submitting your information, you agree that devx.com may send you DevX offers via email, phone and text message, as well as email offers about other products and services that DevX believes may be of interest to you. DevX will process your information in accordance with the Quinstreet Privacy Policy.


Tip of the Day
Language: SQL
Expertise: Intermediate
Mar 12, 2018

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Understanding UNION in MySQL

Assuming there are tables EMP and EMP2, which have the same schema, and there are possible duplicate IDs present in them — the following query will help us identify the unique records:

Schema:

CREATE TABLE EMP (NAME VARCHAR(30), ID INT(5))
CREATE TABLE EMP2 (NAME VARCHAR(30), ID INT(5))

Query:

SELECT ID FROM EMP UNION SELECT ID FROM EMP2;
M S Sridhar
 
Comment and Contribute

 

 

 

 

 


(Maximum characters: 1200). You have 1200 characters left.

 

 

Sitemap
Thanks for your registration, follow us on our social networks to keep up-to-date