This is more one post on mysql query, I don't remember exactly time but i had need to change name of foreign key constraint column field. We can rename field name easily if we didn't set foreign key constraint. But if you set foreign key constraint then you can't rename easily. I had rename directly from my phpmyadmin without mysql query but i found bellow error:
#1025 - Error on rename of './learn/#sql-46c_246' to './learn/my_table' (errno: 150)
But i found the solution of mysql rename foreign key constraint using mysql query, First we have to drop the foreign key,.....