Q.1
Database redesign is especially difficult if the database has no data.
Q.2
Some organizations take the stand that no application should ever employ the true name of a table.
Q.3
A tool that can help designers understand the dependencies of database structures is a:
Q.4
How many copies of the database schema are typically used in the redesign process?
Q.5
Because of the importance of making data model changes correctly, many professionals are ________ about using an automated process for database redesign.
Q.6
The EXISTS keyword will be true if:
Q.7
Changing cardinalities in a database is:
Q.8
The NOT EXISTS keyword will be true if:
Q.9
The data model that is produced from reverse engineering is:
Q.10
To drop a column that is used as a foreign key, first:
Q.11
Before any changes to database structure are attempted one should first:
Q.12
Which of the following modifications may not succeed?
Q.13
How can you find rows that do not match some specified condition?
Q.14
A regular subquery can be processed:
Q.15
What SQL command can be used to add columns to a table?
Q.16

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.17

The EXISTS keyword will be true if:

  • any row in the subquery meets the condition only.
  • all rows in the subquery fail the condition only.
  • both of these two conditions are met.
  • neither of these two conditions is met.
Q.18

Before any changes to database structure are attempted one should first:

  • clearly understand the current structure and contents of the database only.
  • test any changes on a test database only.
  • create a complete backup of the operational database only.
  • All of the above should be done.
Q.19

Which of the following SQL statements are helpful in database redesign?

  • Correlated subqueries only
  • EXISTS/NOT EXISTS expressions only
  • Both of the above are helpful
  • None of the above are helpful.
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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