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Explain in detail about Collaboration Diagrams
Collaboration diagrams are interaction diagrams which emphasize structural organisation of an object that transmit and receive messages. There is always a path in collaboration diagrams which indicate how one object is linked to other and sequence numbers to show the time ordering of a message. The notation for depiction of a collaboration diagram is as:
Figure: Collaboration diagram
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
In object oriented design, which steps must designer take to adjust inheritance? To readjust inheritance following steps should be taken: i) Rearrange and adjust the classe
For problems 1-4, give all candidate keys for the tables with FDs specified. Composite candidate keys must be put in parentheses, and candidate keys must be separated with commas
What is the difference between a key and a superkey? Key - A key a single attribute or a combination of two or more attributes of an entity set which is used to identify one
What is 2NF? A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key.
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
can you create a database for me in oracle/sql
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