Deleting from tables

[Darin Isola]

Hi all,

How would i go about deleting data from 6 different tables, at once?

I've tried 

delete from departments,
delete from enddate,
delete from job_code_desired,
delete from job_code_primary,
delete from job_code_required,
delete from job_code_secondary,
delete from main;

with no luck and:

delete from departments,
enddate,
job_code_desired,
job_code_primary,
job_code_required,
job_code_secondary,
main;

with still no luck.

Is it possible?

TIA,

Darin;