When modifying data in existing columns,which of the following is correct?
A) A column must be as wide as the data it already contains.
B) If a NUMBER column already contains data,its precision and scale can be decreased.
C) Changing the default value of a column will change the values of data already in a table.
D) If a NUMBER column is empty,its precision and scale cannot be changed.

Question

When modifying data in existing columns,which of the following is correct?​
A) ​A column must be as wide as the data it already contains.
B) ​If a NUMBER column already contains data,its precision and scale can be decreased.
C) ​Changing the default value of a column will change the values of data already in a table.
D) ​If a NUMBER column is empty,its precision and scale cannot be changed.

Quizplus · Accepted Answer

When modifying data in existing columns, the column must be as wide as the data it already contains. This means that you cannot decrease the width or size of the column if it already contains data. However, you can increase the size of the column if needed.

When Modifying Data in Existing Columns,which of the Following Is