How many copies of the database schema are typically used in the redesign process? Four One Three Two TRUE ANSWER : ? YOUR ANSWER : ?
The NOT EXISTS keyword will be true if: neither of these two conditions is met. both of these two conditions are met. any row in the subquery meets the condition. all rows in the subquery fail the condition. TRUE ANSWER : ? YOUR ANSWER : ?
Typically, there should be at least two different copies of the database schema used in the redesign process. False True TRUE ANSWER : ? YOUR ANSWER : ?
Database redesign is not terribly difficult if the: database is relatively small. database has no data. database is structured. database is well-designed. TRUE ANSWER : ? YOUR ANSWER : ?
The NOT EXISTS keyword will be true if any row in the subquery meets the condition. False True TRUE ANSWER : ? YOUR ANSWER : ?
A tool that can help designers understand the dependencies of database structures is a: graphical display. None of these data model. dependency graph. TRUE ANSWER : ? YOUR ANSWER : ?
What SQL command can be used to add columns to a table? ALTER TABLE TableName ADD ColumnName MODIFY TABLE TableName ADD ColumnName ALTER TABLE TableName ADD COLUMN ColumnName MODIFY TABLE TableName ADD COLUMN ColumnName TRUE ANSWER : ? YOUR ANSWER : ?
Before any changes to database structure are attempted one should first: All of these test any changes on a test database only. create a complete backup of the operational database only. clearly understand the current structure and contents of the database only. TRUE ANSWER : ? YOUR ANSWER : ?
Because of the importance of making data model changes correctly, many professionals are ________ about using an automated process for database redesign. ambivalent optimistic None of these skeptical TRUE ANSWER : ? YOUR ANSWER : ?
The data model produced from the reverse engineering process does not include intersection table data. True False TRUE ANSWER : ? YOUR ANSWER : ?