Managing Databases with Oracle
SQL*Plus will finish the statement and execute it when the user types in this:

A colon ( : ) followed by [Enter].
A semicolon ( ; ) followed by [Enter].
A left slash ( ) followed by [Enter].
A period ( . ) followed by [Enter].

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Managing Databases with Oracle
Which of the following is not true about modifying table columns?

You can drop a column at any time.
You can increase the number of characters in character columns or the number of digits in numeric columns
You cannot increase or decrease the number of decimal places.
You can add a column at any time as long as it is a NULL column.

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