drop table test88_pks_person
go
drop table test88_pks_employee
go
drop table test88_pks_payroll
go
drop table test88_pks_project
go
drop table test88_pks_address
go
drop table test88_pks_contract
go
drop table test88_pks_category_contract

drop table test88_pks_category
go
drop table test88_nton_a
go
drop table test88_nton_b
go