DATABASE REDESIGN QUIZ

Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.

True

False

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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);

None of these

ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);

ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);

TRUE ANSWER : ?
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The data model that is produced from reverse engineering is:

a conceptual model.

a logical model.

None of these

an internal model.

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What SQL command can be used to delete columns from a table?

MODIFY TABLE TableName DROP ColumnName

ALTER TABLE TableName DROP ColumnName

MODIFY TABLE TableName DROP COLUMN ColumnName

ALTER TABLE TableName DROP COLUMN ColumnName

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Adding null columns to a table is straightforward.

False

True

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What SQL command can be used to add columns to a table?

ALTER TABLE TableName ADD ColumnName

MODIFY TABLE TableName ADD ColumnName

MODIFY TABLE TableName ADD COLUMN ColumnName

ALTER TABLE TableName ADD COLUMN ColumnName

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Database redesign is not terribly difficult if the:

database has no data.

database is structured.

database is well-designed.

database is relatively small.

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Database redesign is especially difficult if the database has no data.

False

True

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The SQL-92 command to change a table name is RENAME TABLE.

True

False

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Typically, there should be at least two different copies of the database schema used in the redesign process.

False

True

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