Database Redesign The EXISTS keyword will be true if: neither of these two conditions is met. any row in the subquery meets the condition only. all rows in the subquery fail the condition only. both of these two conditions are met. neither of these two conditions is met. any row in the subquery meets the condition only. all rows in the subquery fail the condition only. both of these two conditions are met. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Which of the following SQL statements are helpful in database redesign? EXISTS/NOT EXISTS expressions only None of these Both of the above are helpful Correlated subqueries only EXISTS/NOT EXISTS expressions only None of these Both of the above are helpful Correlated subqueries only ANSWER DOWNLOAD EXAMIANS APP
Database Redesign What SQL command can be used to add columns to a table? MODIFY TABLE TableName ADD ColumnName ALTER TABLE TableName ADD COLUMN ColumnName MODIFY TABLE TableName ADD COLUMN ColumnName ALTER TABLE TableName ADD ColumnName MODIFY TABLE TableName ADD ColumnName ALTER TABLE TableName ADD COLUMN ColumnName MODIFY TABLE TableName ADD COLUMN ColumnName ALTER TABLE TableName ADD ColumnName ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Changing cardinalities in a database is: a rare database design task, but does occur. is impossible to do, so a new database must be constructed and the data moved into it. a database design task that never occurs. a common database design task. a rare database design task, but does occur. is impossible to do, so a new database must be constructed and the data moved into it. a database design task that never occurs. a common database design task. ANSWER DOWNLOAD EXAMIANS APP
Database Redesign A tool that can help designers understand the dependencies of database structures is a: dependency graph. data model. graphical display. None of these dependency graph. data model. graphical display. None of these ANSWER DOWNLOAD EXAMIANS APP
Database Redesign A regular subquery can be processed: by nesting. from the bottom up. from the top down. None of these by nesting. from the bottom up. from the top down. None of these ANSWER DOWNLOAD EXAMIANS APP
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