How to drop unique in MySQL?

Question

Create Table: CREATE TABLE `fuinfo` (
  `fid` int(10) unsigned NOT NULL,
  `name` varchar(40) NOT NULL,
  `email` varchar(128) NOT NULL,
  UNIQUE KEY `email` (`email         


        

Answer 1

Simply you can use the following SQL Script to delete the index in MySQL:

alter table fuinfo drop index email;

Answer 2

Use below query :

ALTER TABLE `table_name` DROP INDEX key_name;

If you don't know the key_name then first try below query, you can get key_name.

SHOW CREATE TABLE table_name

OR

SHOW INDEX FROM table_name;

If you want to remove/drop primary key from mysql table, Use below query for that

ALTER TABLE `products` DROP INDEX `PRIMARY`;

Code Taken from: http://chandreshrana.blogspot.in/2015/10/how-to-remove-unique-key-from-mysql.html

Answer 3

This may help others

alter table fuinfo drop index fuinfo_email_unique

Answer 4

Try it to remove uique of a column:

ALTER TABLE  `0_ms_labdip_details` DROP INDEX column_tcx

Run this code in phpmyadmin and remove unique of column

Answer 5

mysql> DROP INDEX email ON fuinfo;

where email is the unique key (rather than the column name). You find the name of the unique key by

mysql> SHOW CREATE TABLE fuinfo;

here you see the name of the unique key, which could be email_2, for example. So...

mysql> DROP INDEX email_2 ON fuinfo;

mysql> DESCRIBE fuinfo;

This should show that the index is removed

Answer 6

DROP INDEX column_name ON table_name

Select the database and query form the sql tab.This removes the index of the particular column. It worked for me in PHP MyADMIN