Which the cost of using a constructor in big model class ?

Hello for all
I am having to do a find and I have an entity(model) with 20 parameters.
The question is:
It is better to ask (by if's) if the parameters are null, if they go I pass null for the object, or to carry that object with the parameters, to use empty strings when it has not data for example, and to send it like this.
Which the cost of the operations in terms of expenses with processor in the first option and memory on secondy? Which the most advantageous?
I thank the collaboration
Thanks

I think the best way to use null. So we can first check whether it is null or not. If it is not null we can proceed further.
Looking performance i think this is better option.

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4/22 PL/SQL ORA-00934: group function is not allowed hereplease help!

You could add the columns to the tables and then you would need a trigger to update those columns. However, you could just as easily select the price * qty to get the cost, without creating an additional column or trigger. I have no idea what you might want to do with a global temporary table. I think you need to explain what your purpose is, before any of us can suggest the best method. Since I have already demonstrated an update with a view, I will demonstrate an update with the cost column added to the odetails table and a trigger as you asked about. Notice that you will need triggers on both tables, the one that has qty and the one that has price.
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2    (pno    number(5) not null primary key,
3      pname varchar2(30),
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10 /
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14 /
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scott@ORA92> insert into parts values (1, 'name1', 1, 10, 1)
2 /
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scott@ORA92> insert into odetails values (1, 1, 22, null)
2 /
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2 /
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2 /
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scott@ORA92> select * from parts
2 /
       PNO PNAME                                 QOH      PRICE     OLEVEL
         1 name1                                   1         11          1
scott@ORA92> select * from odetails
2 /
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scott@ORA92> select o.ono, o.pno, o.qty, (o.qty * p.price) as cost
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4 /
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