If I have a table In database which called occupations  columns are: workid, workname, salary and sector  workid is a primary key and increase  I insert to the table  1, fireman , 500, 2 2, officer, 800, 1 the code in html / php  Will show a drop menu select the workname from the table in the database so the menu will show the fireman and the officer As soon the user choose one of them(onchange) will be a textbox display just the salary  do I need a JavaScript to create function to put for onchange ?  how to write the code in php thanks in ad

If I have a table In database which called occupations 

columns are: workid, workname, salary and sector 

workid is a primary key and increase 

I insert to the table 

1, fireman , 500, 2

2, officer, 800, 1

the code in html / php 

Will show a drop menu select the workname from the table in the database so the menu will show the fireman and the officer

As soon the user choose one of them(onchange)

will be a textbox display just the salary 

do I need a JavaScript to create function to put for onchange ? 
how to write the code in php

thanks in ad