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Database
Database Redesign
Quiz 1
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Q.1
Typically, there should be at least two different copies of the database schema used in the redesign process.
True
False
Q.2
The use of the double NOT EXISTS can be used to find rows that do not match some specified condition.
True
False
Q.3
Although creating test databases is a critical and necessary job, there are few career opportunities in this area.
True
False
Q.4
Because of the need for extensive knowledge of SQL, many database developers choose to automate the redesign process.
True
False
Q.5
The data model produced from the reverse engineering process does not include intersection table data.
True
False
Q.6
If a database is built correctly the first time, it will not have to be redesigned.
True
False
Q.7
A correlated subquery is processed as a nested subquery.
True
False
Q.8
A regular subquery is processed from the bottom up.
True
False
Q.9
Correlated subqueries are similar to a regular subquery.
True
False
Q.10
The data model produced from the reverse engineering process is a true logical model.
True
False
Q.11
It is not easy to build a database correctly the first time.
True
False
Q.12
Information systems and organizations do not just influence each other; they create each other.
True
False
Q.13
Adding null columns to a table is straightforward.
True
False
Q.14
The NOT EXISTS keyword will be true if any row in the subquery meets the condition.
True
False
Q.15
Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.
True
False
Q.16
The EXISTS keyword will be true if any row in the subquery meets the condition.
True
False
Q.17
The SQL-92 command to change a table name is RENAME TABLE.
True
False
Q.18
Reverse engineering is the process of reading a database schema and producing a data model from that schema.
True
False
Q.19
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?
ALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0);
ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);
ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);
None of the above is correct.
Q.20
Which is not true of a correlated subquery?
EXISTS/NOT EXISTS is a form of a correlated subquery.
The processing of the SELECT statements is nested.
They can be used to verify functional dependencies.
They are very similar to a regular subquery.
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