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How to use a calculated column in the same query

551174Jun 5 2009 — edited Jun 5 2009
Hi All,

I need some help with using a calculated column in the same query.
For eq

I am joining a couple of tables and some of the select columns are calculated based on the columns of the tables and i want a new column in the same query to use this calculated feild in some other calcualtion.

something like this...

select (12+3) as Sum1, (12-3) as Sum2, (Sum1 + Sum2 ) as Sum3
from dual
or
select (12+3) as "Sum1", (12-3) as "Sum2", CASE WHEN ( "Sum1" / "Sum2" * 100 > 0 ) THEN 'Yes' ELSE 'No' END
from dual


Thanks

Comments

Peter Gjelstrup
Hi,

You need to re-select it
select sum1, sum2, sum1 + sum2 sum3
  from (
           select (12+3) as Sum1, (12-3) as Sum2 from dual
);
Regards
Peter
SanjayRs
Something like this 
with data as ( 
select (12+3) as "Sum1", 
  (12-3) as "Sum2" from dual 
)
--
select "Sum1", "Sum2",  
  CASE WHEN ( "Sum1" / "Sum2" * 100 > 0 ) 
  THEN 'Yes' ELSE 'No' END
from data
/


      Sum1       Sum2 CAS
---------- ---------- ---
        15          9 Yes
SS
unknown-698157
select sum1, sum2, sum1+sum2 sum3
from
(select (12+3) as Sum1, (12-3) as Sum2
from dual
)

Seems to be homework time tonight.


-----------------
Sybrand Bakker
Senior Oracle DBA

Experts: those who did read documentation.
damorgan
Sure looks like a student to me. And one without an installed copy of the product.

Perhaps you should suggest a WITH CLAUSE query just to clearly show the instructor that the student was cheating.

WITH q AS (select (12+3) as Sum1, (12-3) as Sum2 from dual)
....;
Centinul
user548171 wrote:
select (12+3) as Sum1, (12-3) as Sum2, (Sum1 + Sum2 ) as Sum3
from dual
or
select (12+3) as "Sum1", (12-3) as "Sum2", CASE WHEN ( "Sum1" / "Sum2" * 100 > 0 ) THEN 'Yes' ELSE 'No' END
from dual


Thanks
What about just repeating the column values:
select (12+3) as "Sum1", (12-3) as "Sum2", CASE WHEN ( (12+3) / (12-3)  * 100  > 0 )  THEN 'Yes' ELSE 'No'  END FROM DUAL
551174
thanks for the reply
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Locked on Jul 3 2009
Added on Jun 5 2009
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