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Formula Column return Null value ???? [message #181281]

Sat, 08 July 2006 02:06

kamran.it
Messages: 265
Registered: September 2005
Location: Karachi

Senior Member

===report 6i==

there is 2 fields qty1 and qty2
qty1 has data but qty2 has not any data
but when I execute this function it return null value while qty1 has values.Why???

function CF_1Formula return Number is
temp number;
begin
temp:= :qty1+:qty2;
return(temp);
end;

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Re: Formula Column return Null value ???? [message #181290 is a reply to message #181281]

Sat, 08 July 2006 04:49

Rehan Mirza
Messages: 67
Registered: July 2004
Location: Pakistan

Member

use Nvl Function for yours required task
see yours correct code

function CF_1Formula return Number is
temp number;
begin
temp:= Nvl(:qty1,0)+ Nvl(:qty2,0);
return(temp);
end;

it will sole yours problem

take care

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Re: Formula Column return Null value ???? [message #181299 is a reply to message #181281]

Sat, 08 July 2006 05:39

Maaher
Messages: 7065
Registered: December 2001

Senior Member

kamran.it wrote on Sat, 08 July 2006 09:06

qty1 has data but qty2 has not any data
but when I execute this function it return null value while qty1 has values.Why???

This is expected behaviour: NULL is "the absence of a value". You could see it as "I don't know" to make it easier to understand. If you have an unknown value (NULL) and add 1 to it, how much do you get? I don't know (NULL). This approach is not perfect but it can help you understand this NULL logic.

As for the solution: Rehan Mirza has provided one.

MHE

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Re: Formula Column return Null value ???? [message #181307 is a reply to message #181299]

Sat, 08 July 2006 07:10

kamran.it
Messages: 265
Registered: September 2005
Location: Karachi

Senior Member

Mr. Rehan

It is returning 0 ????

I want to do :-

temp1:= :Quantity*:price; ------ (it has values)
temp := :Pes_quantity*:Pes_price; ------(no any value)
tot := nvl(temp,0) + nvl(temp1,0);
return (tot);

result = 0

why???

[Updated on: Sat, 08 July 2006 07:15]

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Re: Formula Column return Null value ???? [message #181328 is a reply to message #181281]

Sat, 08 July 2006 14:30

dude4084
Messages: 222
Registered: March 2005
Location: Mux

Senior Member

Hi

Rule of thumb

"Null multiplied into anything will result in NULL"

So if the :Quantity or :Pes_quantity will have NULL then it will reult NULL in Temp or Temp1.

Remedy:
Use NVL function as follow:

NVL(:Quantity,0) instead of :Quantity

and

NVL(:Pes_quantity) instead of :Pes_quantity

-Dude

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Re: Formula Column return Null value ???? [message #181421 is a reply to message #181328]

Mon, 10 July 2006 01:06

kamran.it
Messages: 265
Registered: September 2005
Location: Karachi

Senior Member

Thank You

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