SQL: set existing column as Primary Key in MySQL

Question

I have a database with 3 columns:

id, name, somethingelse  

This table has no index set and i am getting \"No index defined!\" in phpmyadmin

Answer 1

alter table table_name
add constraint myprimarykey primary key(column);

reference : http://www.w3schools.com/sql/sql_primarykey.asp

Answer 2

If you want to do it with phpmyadmin interface:

Select the table -> Go to structure tab -> On the row corresponding to the column you want, click on the icon with a key

Answer 3

Either run in SQL:

ALTER TABLE tableName
  ADD PRIMARY KEY (id)           ---or Drugid, whichever you want it to be PK

or use the PHPMyAdmin interface (Table Structure)

Answer 4

ALTER TABLE your_table
ADD PRIMARY KEY (Drugid);

Answer 5

Go to localhost/phpmyadmin and press enter key. Now select:

database --> table_name --->Structure --->Action  ---> Primary -->click on Primary