Database Redesign The use of the double NOT EXISTS can be used to find rows that do not match some specified condition. False True False True ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Database redesign is not terribly difficult if the: database is well-designed. database is structured. database has no data. database is relatively small. database is well-designed. database is structured. database has no data. database is relatively small. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Before any changes to database structure are attempted one should first: All of these clearly understand the current structure and contents of the database only. create a complete backup of the operational database only. test any changes on a test database only. All of these clearly understand the current structure and contents of the database only. create a complete backup of the operational database only. test any changes on a test database only. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign What SQL command can be used to delete columns from a table? ALTER TABLE TableName DROP ColumnName MODIFY TABLE TableName DROP ColumnName ALTER TABLE TableName DROP COLUMN ColumnName MODIFY TABLE TableName DROP COLUMN ColumnName ALTER TABLE TableName DROP ColumnName MODIFY TABLE TableName DROP ColumnName ALTER TABLE TableName DROP COLUMN ColumnName MODIFY TABLE TableName DROP COLUMN ColumnName ANSWER DOWNLOAD EXAMIANS APP
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? None of these EXISTS/NOT EXISTS expressions only Correlated subqueries only Both of the above are helpful None of these EXISTS/NOT EXISTS expressions only Correlated subqueries only Both of the above are helpful ANSWER DOWNLOAD EXAMIANS APP
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