Database Redesign Before any changes to database structure are attempted one should first: create a complete backup of the operational database only. test any changes on a test database only. clearly understand the current structure and contents of the database only. All of these create a complete backup of the operational database only. test any changes on a test database only. clearly understand the current structure and contents of the database only. All of these ANSWER DOWNLOAD EXAMIANS APP
Database Redesign Adding null columns to a table is straightforward. False True False True ANSWER DOWNLOAD EXAMIANS APP
Database Redesign The NOT EXISTS keyword will be true if any row in the subquery meets the condition. False True False True ANSWER DOWNLOAD EXAMIANS APP
Database Redesign The data model that is produced from reverse engineering is: a conceptual model. an internal model. a logical model. None of these a conceptual model. an internal model. a logical model. None of these ANSWER DOWNLOAD EXAMIANS APP
Database Redesign A correlated subquery is processed as a nested subquery. True False True False ANSWER DOWNLOAD EXAMIANS APP
Database Redesign What SQL command can be used to add columns to a table? ALTER TABLE TableName ADD COLUMN ColumnName MODIFY TABLE TableName ADD ColumnName MODIFY TABLE TableName ADD COLUMN ColumnName ALTER TABLE TableName ADD ColumnName ALTER TABLE TableName ADD COLUMN ColumnName MODIFY TABLE TableName ADD ColumnName MODIFY TABLE TableName ADD COLUMN ColumnName ALTER TABLE TableName ADD ColumnName ANSWER DOWNLOAD EXAMIANS APP
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