When to use aggregation?
hi all,
I have a question about using Aggregation relationship.
if we have a class Cat and its attributes are name, age, height.
I don't really have to draw another classes .. Class Name, Class Age and Class Height, I just write them in the same class Cat right??
but if the attributes were Body, Leg, Head. they should be seperate classes: Class Body, Class Leg and Class Head. why is in the first situation I just add them in the Cat class and the other case they should have their own classes? I need to know the difference or the reason, so I don't get confused in drawing class diagrams.
Thank you
mshadows wrote:
hi all,
I have a question about using Aggregation relationship.
if we have a class Cat and its attributes are name, age, height.
I don't really have to draw another classes .. Class Name, Class Age and Class Height, I just write them in the same class Cat right?? Right
but if the attributes were Body, Leg, Head. they should be seperate classes: Class Body, Class Leg and Class Head. Not necessarily. It depends on how you will use this information.
why is in the first situation I just add them in the Cat class and the other case they should have their own classes? A Leg or Head can have lots of attributes (width, height, color, hairiness, and boolean attributes like isBleeding or whatever). Well Age and Height are single attributes. i.e. there is one value. Leg and Head are entities/objects and age or height are attributes and describe the entity/object.
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CODE_FARMAKOU EMP_NAME PACKTYPE PACKSIZE SUM_POSOTITA
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1000003279 MOXACEF BT 40(BLIST10X4) 1
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1000000760 DEPON BT 20(BLIST2X10) 1NOTE :Sorry, I tried to pose some sample data using the "with" statement but i couldn't...the error ORA-32035 : unreferenced query name defined in WITH clause was displayed..
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sql>select deptno, cnt, row_number() over (order by cnt desc) rn
2 from (select deptno, count(*) cnt
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20 5 2
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sql>select deptno, cnt, rn
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3 from (select deptno, count(*) cnt
4 from emp
5 group by deptno));
DEPTNO CNT RN
30 6 1
20 5 2
10 3 3
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3 from (select deptno, count(*) cnt
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20 5
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