Postgres Pro
Downloads
Home   >   mailing lists

Thread: Conditional expresion in query

Conditional expresion in query

From
JORGE MALDONADO
Date:
I have been reading about contidional expresions in a query and I have a question about the following example included in the documentation:

SELECT a,      CASE WHEN a=1 THEN 'one'           WHEN a=2 THEN 'two'           ELSE 'other'      END   FROM test;

I would like to make a few changes but I need to give a name (an alias) to the result of  the CASE. Can an "AS" be added as shown below?

SELECT a, b,      CASE WHEN a=b THEN a           ELSE a || '-' || b      END AS ab   FROM test;


Respectfully,
Jorge Maldonado


Re: Conditional expresion in query

From
"Oliveiros d'Azevedo Cristina"
Date:
Yes, it does.
Can't see why not.
 
Why do you ask that, Jorge?
 
Have you tried and it failed?
 
Best,
Oliveiros
----- Original Message -----
Sent: Thursday, February 09, 2012 3:25 PM
Subject: [NOVICE] Conditional expresion in query

I have been reading about contidional expresions in a query and I have a question about the following example included in the documentation: 

SELECT a,      CASE WHEN a=1 THEN 'one'           WHEN a=2 THEN 'two'           ELSE 'other'      END   FROM test;

I would like to make a few changes but I need to give a name (an alias) to the result of  the CASE. Can an "AS" be added as shown below?

SELECT a, b,      CASE WHEN a=b THEN a           ELSE a || '-' || b      END AS ab   FROM test;


Respectfully,
Jorge Maldonado