I am trying to add a new column to my table and making it the primary key. The problem is that i already have a primary key in the table. I cant seem to delete the column which is already the primary key and i cant seem to add the new column as i want to make it the primary key, and there is already a primary key in the table. So how do i do this??
Here is what i have tried and none of it works:
alter table emp add column ID int(5) auto_increment first; (empID is the new column i want to make the new primary key)
alter table emp drop index username; (username is the present primary i want to change)
How to add a new column to table and make it pri key
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