What Are The Pre-requisites To Modify Datatype Of A Column And To Add

1.	What Are The Pre-requisites To Modify Datatype Of A Column And To Add A Column With Not Null Constraint?
Answer» To modify the DATATYPE of a column the column must be EMPTY. To ADD a column with NOT NULL constrain, the table must be empty.

What Are The Pre-requisites To Modify Datatype Of A Column And To Add A Column With Not Null Constraint?

Answer»