Database Redesign If a database is built correctly the first time, it will not have to be redesigned. True False True False ANSWER DOWNLOAD EXAMIANS APP
Database Redesign 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. 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. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Which is not true 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. 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. EXISTS/NOT EXISTS is a form of a correlated subquery. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database. True False True False ANSWER DOWNLOAD EXAMIANS APP
Database Redesign How many copies of the database schema are typically used in the redesign process? One Three Four Two One Three Four Two ANSWER DOWNLOAD EXAMIANS APP
Database Redesign The NOT EXISTS keyword will be true if: all rows in the subquery fail the condition. any row in the subquery meets the condition. neither of these two conditions is met. both of these two conditions are met. all rows in the subquery fail the condition. any row in the subquery meets the condition. neither of these two conditions is met. both of these two conditions are met. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS