How to remove unique key from mysql table

Question

I need to remove a unique key from my mysql table. How can remove that using mysql query.

I tried this but it is not working

alter table tbl_quiz_attempt         


        

Answer 1

To add a unique key use :

alter table your_table add UNIQUE(target_column_name);

To remove a unique key use:

alter table your_table drop INDEX target_column_name;