Question

How to delete the emp whose manager is in New York?

Employee table

empid       name           salary          location
101          john          10000           newyork
102          pavan         25000           newyork
103          laxman        10000           ahmedabad
104          ram           15000           usa
105          arjun         30000           washington
106          gopal         12000           washington

Table department columns

empid       dept    managerid
101         a        102
102         a
103         a         102
104         b         105
105         b         
106         b         105

Answer 1

delete from emplyoee where empid in(
select e.empid from emplyoee  e 
left outer join emplyoee   e1 on e.empid=e1.empid
left outer join department d on d.managerid=e1.empid
where e1.location='usa'
)