/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

19 votes61 views6 answers
Laravel rename table
PHP
1 vote35 views3 answers
Remove certain haracters from a string php
PHP
3 votes42 views2 answers
With function laravel
PHP
0 vote51 views1 answer
File viewer codeigniter
PHP CodeIgniter
1 vote47 views1 answer
Laravel model with methos custom columns
PHP
0 vote51 views1 answer
Laravel model uploaded file name
PHP Laravel
0 vote42 views1 answer
Array & multi-dimensional array
PHP
4 votes37 views4 answers
Laravel carbon today date format
PHP
0 vote49 views1 answer
What is errore Personal access client not found. Please create one in laravel
PHP Laravel
0 vote53 views1 answer
Check current pages is a child page wordpress
PHP Wordpress