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Queries of Joins
Presented By :Monika Segal
Asst. ProfessorDept. CSE
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create table dept_m ( id int primary key, name varchar(20)
);
insert into dept_m values (101,'CSE');
create table emp_m ( id int primary key, name varchar(20),
salary number(8), dept_id int references dept_m(id) ); insert into
emp_m values (1,'A',36000, 101 ); insert into emp_m (id, name,
salary) values (6,'F',54000);
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select * from dept_m; select * from emp_m;
select * from dept_m natural join emp_m;
select * from dept_m inner join emp_m on dept_m.id =
emp_m.dept_id;
select * from dept_m, emp_m where dept_m.id = emp_m.dept_id;
select * from dept_m, emp_m where dept_m.id= emp_m.dept_idand
emp_m.salary >40000;
select * from dept_m, emp_m where emp_m.salary >40000;
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select * from dept_m cross join emp_m;
create table emp_m1
(
e_id int primary key,
name varchar(20),
salary number(8),
id int
references dept_m(id)
);
alter table emp_m1 rename column name to e_name;
select * from dept_m natural join emp_m;
select * from dept_m natural join emp_m1;
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select * from dept_m full outer join emp_m on dept_m.id =
emp_m.dept_id;
select * from dept_m, emp_m where dept_m.id(+) =
emp_m.dept_id;
select * from dept_m right outer join emp_m on dept_m.id =
emp_m.dept_id;
select * from dept_m, emp_m where dept_m.id =
emp_m.dept_id(+);
select * from dept_m left outer join emp_m on dept_m.id =
emp_m.dept_id;
select * from dept_m inner join emp_m on dept_m.id =
emp_m.dept_id;
select * from dept_m, emp_m where dept_m.id = emp_m.dept_id;
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select a.e_id,a.e_name,b.e_id, b.e_name from emp_m1 a , emp_m1 b
where a.mgr_id=b.e_id;
select * from dept_m , emp_m;
select * from dept_m where id in ( select dept_id from emp_m
where salary > 40000);
select * from dept_m where id in( select dept_id from emp_m
group by dept_id having count(id)>1);
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select sum(salary), avg(salary), min (salary), max(salary),
count(*), count(dept_id) from emp_m;
select sum(salary) from emp_m group by dept_id;
select sum(salary) from emp_m group by dept_id having
sum(salary)> 90000;
