create table customer(id number(4),name varchar2(20),age number(4),addresss varchar2(20),salary number(7));
insert into customer values(1,'anu',23,'delhi',30000);
insert into customer values(1,'ammu',33,'madurai',20000);
insert into customer values(1,'anitha',27,'dubai',10000);
select*from customer;
select*from customer where age<=27 AND salary>=20000;