Adds columns to, drops columns from, and changes column attributes in an existing table. Adds, modifies, and drops integrity constraints from an existing table. Restriction: You cannot use any type of ...

When you use CREATE TABLE or ALTER TABLE, database and session settings influence and possibly override the nullability of the data type that is used in a column definition. We recommend that you ...

Any column that is not modified retains its original values, except in certain queries using the CASE expression. See CASE expression for a description of CASE expressions.. To add, drop, or modify a ...