/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 vote327 views1 answer
Smarty foreach
PHP
0 vote317 views1 answer
Laravel 8 db like query
PHP
1 vote307 views1 answer
Check if session variable exists php
PHP
3 votes296 views5 answers
Class 'App\Http\Controllers\Validator' not found
PHP
5 votes252 views6 answers
Php remove duplicates from multidimensional array
PHP
2 votes332 views1 answer
Laravel get subdomain
PHP Laravel
0 vote267 views1 answer
Apache laravel htaccess
PHP
15 votes324 views3 answers
Laravel date set timezone
PHP
3 votes360 views1 answer
Laravel e commerce full project
PHP Laravel
0 vote304 views1 answer
Laravel query builder select first
PHP