How Do I Solve This Type Of Problem

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Pl find below Code

create table testi3 (empcode varchar(30), payroll_code varchar(30),pprdfrom int,pprdto int)

2. insert values
insert into testi3 values ('1','S0010',90,93)
insert into testi3 values ('1','S0009',93,94)
insert into testi3 values ('1','S0008',94,NULL)
insert into testi3 values ('2','S0008',94,NULL)
insert into testi3 values ('2','S0010',90,93)
insert into testi3 values ('3','S0010',90,93)

3. now if we execute below i get output (1,2)
select * from testi3
where pprdto is null

4. now if we execute below i get output (1,2,3) but i only need 3 since other 1,2 as Null in there previous rows,
select * from testi3
where pprdto is not null

so kindly help with a logic how get only 3

Posted 1-Apr-14 4:13am

Kannan 261190

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Peter Leow · Accepted Answer · 2014-04-01T04:26:00

Solution 2

SQL

select * from testi3 t1
where not exists
(
  select * from testi3 t2 where
   pprdto is null and t1.empcode = t2.empcode
)

Posted 1-Apr-14 4:26am

Peter Leow

Comments

Kannan 261190 1-Apr-14 11:32am

Thank you, how exactly write in inner join

Kannan 261190 1-Apr-14 11:38am

ok i got it , thank you very much

Abhinav S · Accepted Answer · 2014-04-01T04:21:00

Solution 1

Try

SQL

select * from testi3
where pprdto is not null and emp_code not in (select emp_code from testi3 where pprdto is null)

A neater solution would be to use inner join on the same table instead of using a sub-query.

Posted 1-Apr-14 4:21am

Abhinav S

Comments

Kannan 261190 1-Apr-14 11:33am

Thank you, ok i got it