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Database Redesign
Changing cardinalities in a database is:
a common database design task.
a rare database design task, but does occur.
a database design task that never occurs.
is impossible to do, so a new database must be constructed and the data moved into it.
Correct Answer:
a common database design task.
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Database Redesign
Which is not true of a correlated subquery?
The process of reading a database schema and producing a data model from that schema is known as:
Because of the importance of making data model changes correctly, many professionals are ________ about using an automated process for database redesign.
Which of the following modifications may not succeed?
What SQL command will allow you to change the table STUDENT to add the constraint named GradeCheck that states that the values of the Grade column must be greater than 0?
Database redesign is not terribly difficult if the:
The data model produced from the reverse engineering process does not include intersection table data.
The NOT EXISTS keyword will be true if any row in the subquery meets the condition.
It is not easy to build a database correctly the first time.
Adding null columns to a table is straightforward.
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