Database Redesign Before any changes to database structure are attempted one should first: test any changes on a test database only. create a complete backup of the operational database only. All of these clearly understand the current structure and contents of the database only. test any changes on a test database only. create a complete backup of the operational database only. All of these clearly understand the current structure and contents of the database only. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Which of the following modifications may not succeed? Changing a column data type from char to date Changing a column data type from numeric to char Both of the above actions should succeed Neither of the above actions will succeed Changing a column data type from char to date Changing a column data type from numeric to char Both of the above actions should succeed Neither of the above actions will succeed ANSWER DOWNLOAD EXAMIANS APP
Database Redesign How can you find rows that do not match some specified condition? NOT EXISTS EXISTS Double use of NOT EXISTS None of these NOT EXISTS EXISTS Double use of NOT EXISTS None of these ANSWER DOWNLOAD EXAMIANS APP
Database Redesign A regular subquery can be processed: None of these from the top down. from the bottom up. by nesting. None of these from the top down. from the bottom up. by nesting. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign What SQL command can be used to add columns to a table? ALTER TABLE TableName ADD ColumnName MODIFY TABLE TableName ADD COLUMN ColumnName MODIFY TABLE TableName ADD ColumnName ALTER TABLE TableName ADD COLUMN ColumnName ALTER TABLE TableName ADD ColumnName MODIFY TABLE TableName ADD COLUMN ColumnName MODIFY TABLE TableName ADD ColumnName ALTER TABLE TableName ADD COLUMN ColumnName ANSWER DOWNLOAD EXAMIANS APP
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