Managing Databases with Oracle
When using SQL*Plus, Oracle commands, column names, table names and all other database elements:

are case insensitive.
must always be in lower case.
must always be in upper case.
are case sensitive.

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

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