phpMyAdmin primary key indicator showing grey on text

Question

In phpMyAdmin it's really hard to see which column has been assigned PK. If base on the color of icon, it's doesn't make sense because I assume column with data type text have a grey icon.

Answer 1

In PhpMyadmin primary key identify by underline in column name.

In your case, you have underline in task_id.

other grey color means , you can't assign primary key to that column .