why this query can delete duplicates ?


Posted on 16th Feb 2014 07:03 pm by admin

why this query can delete duplicates ? Anybody can give me the detailed explanation ?

Thanks

select salary from employees union select salary from employees;

No comments posted yet

Your Answer:

Login to answer
203 Like 28 Dislike
Previous forums Next forums
Other forums

The control with ID 'ace' requires a ScriptManager on the page
I'm trying to add a simple AlwaysVisibleControlExtender to my page, but it's not working. I get the

Need help in log in and log out?
hi there all of u. i have recently created a site for someone. i have placed log in and log out and

Putting double spaces instead of single spaces
Im looking at trying to replace all single spacing between fields with double spacing

At pres

Entering Data Problem
Code: $result = mysql_query("SELECT * FROM flights");
while ($row = mysql_fetch_array($

Values disappear from my array :( HELP!
hey all, I have a lil mysql/php/apache script that queries a database
and pulls put 5 integers.

PHP - HTTP Digest Authentication - Understanding Code Help
Hi Everyone,

This is my first time on your website and please excuse if I am asking silly que

Saving PHP output as a file
I wondered if anyone knows how to save the rendered output of a PHP script as a file?

I have

Warning message
I've put a website that I was doing live and I'm getting this warning message when I try to add a ne

Why Are These Functions Causing MASSIVE Memory Problems? Please Help!
Hi,

I have a script with some options.

I use regex to replace patterns in strings, but

help me fix these syntax errors...
I keep getting multiple syntax errors on this script like this one:

Parse error: syntax error

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash