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Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
A domain is a set of permissible values that can be given to an attribute. So each attribute in a table has a definite domain. Values to these attributes cannot be assigned outside
compare the features of oracle RDBMS with MySQL and Microsoft SQL server
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
Critically evaluate the bulleted list of information-related items in this case study. How are each contradictory to the notion of being an information-literate knowledge worker?
For this application, we will consider IBM DB2 catalog data (i.e., metadata) for IBM's enterprise-class servers running the z/OS (formerly OS/390 or MVS) operating system. One of
Given the following relations TRAIN (NAME, START, DEST) TICKET (PNRNO., START, DEST, FARE) PASSENGER (NAME, ADDRESS, PNRNO.) Write SQL expressions for the following queries: No
i want notes on this topic
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
An entity type usually has an attribute whose values are distinct for every individual entity in the collection. Such an attribute is known as a key attribute and its values can be
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