Tài liệu PL/SQL User’s Guide and Reference phần 10

column_name
This is the name of the column (or one of the columns) to be updated. It must be the
name of a column in the referenced table or view. A column name cannot be
repeated in the column_name list. Column names need not appear in the UPDATE
statement in the same order that they appear in the table or view.
returning_clause
This clause lets you return values from updated rows, thereby eliminating the need
to SELECT the rows afterward. You can retrieve the column values into variables
and/or host variables, or into collections and/or host arrays. However, you cannot
use the RETURNING clause for remote or parallel updates. For the syntax of
returning_clause, see DELETE Statement on page 11-52.