/PHP/How unique field in table in phpmyadmin

How unique field in table in phpmyadmin

1 ) ALTER TABLE  `foo` ADD UNIQUE ( `bar` )

or 

2 ) You do not have duplicates -> will apply the key without issues
You do have duplicates -> will give an error message, nothing happened to your data
All is unique, except several rows with NULL in them, unique constraint is still applied, as NULL is not checked when checking for unique values (you can have the entire table have a NULL value in a unique field without any error message).

Similar codes

0 vote134 views1 answer
Php get function from different file
PHP
-1 vote132 views1 answer
Create user with tinker php laravel
PHP
6 votes174 views6 answers
Laravel folder permission
PHP
1 vote155 views1 answer
Wp get image alt
PHP Wordpress
1 vote151 views1 answer
Regex php password
PHP
24 votes138 views3 answers
Find days with name between two dates in php
PHP
0 vote252 views1 answer
Laravel dompdf barcode
PHP Laravel
0 vote153 views1 answer
Controller class does not exist laravel
PHP Laravel
0 vote127 views2 answers
Php access key stdClass object
PHP
1 vote133 views1 answer
Php get bool from string
PHP