If construct

Ato · #1 (**permalink**) 07-03-09, 10:37

Hi, in the following mysql select statement i use an if construct to get a sign changed in the recordset.

SELECT a.fieldone, a.fieldtwo, if(a.fieldone="x",a.fieldthree,-a.fieldthree) as myfield FROM mytable a

I would like to have the same result on an informix db. Is it possible? If so, what is the If syntax?

Many thanks in advance.

//andrea

bigcalm · #2 (**permalink**) 07-03-09, 12:58

decode() is functionally similar.

Manual and examples here - IBM Informix Dynamic Server v10 Information Center

SELECT a.fieldone, a.fieldtwo, decode(a.fieldone,"x",a.fieldthree,-a.fieldthree) as myfield
FROM mytable a

Ato · #3 (**permalink**) 07-05-09, 04:02

thanks a lot, bigcalm

Tyveleyn · #4 (**permalink**) 07-06-09, 17:33

Or CASE. Is more useful then decode() when an unknown kind of different cases have to be covered by ELSE.

Code:

SELECT  CASE fieldone
	WHEN 'x' THEN fieldthree
	WHEN 'y' THEN ...
	ELSE -fieldthree
	END myfield
FROM mytable;

Regards,
Hans

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