Exam 6: Updating Data

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By placing a(n)____________________ command in an INSERT command,you can add the query results to a table.​

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To add a new column,use the ADD NEW COLUMN clause of the ALTER TABLE command.

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In SQL Server,execute the sp_columns command to list all the columns in a table.

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The ROLLBACK command reverses changes made to the ____________________ only.​

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It is a good idea to use a SELECT command to display the data you changed to verify that the correct update was made.

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A(n)____________________ is a logical unit of work.​

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You cannot change the characteristics of existing columns.

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Updates become permanent automatically when you exit from the DBMS.

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Which of the following commands executes a rollback?​

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In Oracle 11 g,a null value is displayed as a hyphen.

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When necessary,include a WHERE clause into the UPDATE command to indicate the column on which the change is to take place.

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The ADD clause consists of the word ADD followed by the name of the ____________________ to be added,followed by the characteristics.​

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You can use the ____ command to create a new table using data in an existing table.​

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In SQL,use the ____ data type for variable-length character columns.​

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In Oracle,use the ____ command to display the structure of a table.​

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To change a column that currently rejects null values so that it accepts null vlaues,use the ____________________ clause in the ALTER TABLE command.​

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In a transaction,if you can complete all updates successfully,execute the ____________________ command after completing the final update.​

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If you have verified that the update you made is correct,you can use the ____ command to make the update permanent.​

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If you decide that you do not want to save the changes you have made during your current work session,you can reverse the changes by executing the ____________________ command.​

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You can delete a table that is no longer needed by using the ____________________ TABLE command.​

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