use adventureworks ;
goselect distinct c.lastname, c.firstname
from person.contact c join humanresources.employee e
on e.contactid = c.contactid where employeeid in
(select salespersonid
from sales.salesorderheader
where salesorderid in
(select salesorderid
from sales.salesorderdetail
where productid in
(select productid
from production.product p
where productnumber like'fw%')));
goselect emp.empno,emp.ename,emp.job,emp.sal from scott.emp where sal>=(select sal from scott.emp where ename='ward');
select * from company
where age = ( select age from company
where name = taihang)
select emp.empno,emp.ename,emp.job,emp.sal from scott.emp where sal in (select sal from scott.emp where ename='ward');
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