Database Redesign A tool that can help designers understand the dependencies of database structures is a: graphical display. data model. None of these dependency graph. graphical display. data model. None of these dependency graph. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Which of the following SQL statements are helpful in database redesign? EXISTS/NOT EXISTS expressions only Correlated subqueries only None of these Both of the above are helpful EXISTS/NOT EXISTS expressions only Correlated subqueries only None of these Both of the above are helpful ANSWER DOWNLOAD EXAMIANS APP
Database Redesign 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. All of these create a complete backup of the operational database only. clearly understand the current structure and contents of the database only. test any changes on a test database only. All of these create a complete backup of the operational database only. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Database redesign is not terribly difficult if the: database has no data. database is relatively small. database is well-designed. database is structured. database has no data. database is relatively small. database is well-designed. database is structured. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign To drop a column that is used as a foreign key, first: drop the foreign key constraint. All of these drop the table containing the foreign key. drop the primary key. drop the foreign key constraint. All of these drop the table containing the foreign key. drop the primary key. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign The EXISTS keyword will be true if any row in the subquery meets the condition. False True False True ANSWER DOWNLOAD EXAMIANS APP
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