Possible problems when employing them to make surrogate keys
What are sequences, and what are the possible problems when employing them to make surrogate keys?
Expert
A sequence is an object which makes a sequential series of exclusive numbers. Sequences are most often employed to provide values for surrogate keys. But, there are three problems with employing sequences. First, a developer can employ a defined sequence for any aim; and when a sequence is employed for purposes other than the surrogate key, some values will be absent. A second problem is that there is nothing in the schema which prevents someone from issuing an INSERT statement which adds data to the table however which does not employ the sequence. Finally, it is possible to employ the wrong sequence when putting data into a table.
You have two tables, STUDENT and COMPUTER which are in a one-to-one relationship. The foreign key is StudNumber in COMPUTER that references StudNumber as the primary key of STUDENT. Describe what must be done to convert the one--to-one STUDENT -COMPUT
What is meant by star schema?
How can we increase the performance within the Data Stage?
Illustrate briefly the term insertion and deletion anomalies?
Explain and compare a procedure and a trigger?
Briefly describe time series algorithm in data mining?
Elucidate how many kinds of dimensions are accessible in the Informatica?
Explain the way to audit the SQL sent to the server.
Illustrates the term Open Server in Sybase?
What can be done with the Data Stage Director?
18,76,764
1961501 Asked
3,689
Active Tutors
1451382
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!