oracle sql update a date code example

Example 1: oracle update with

UPDATE mytable t		-- Update using WITH statement
SET value3 = (
    WITH comp AS (
        SELECT id, value1
        FROM mytable t
        WHERE value2 > 10
    )
    SELECT c.value1
    FROM comp c
    WHERE c.id = t.id
);

Example 2: oracle SQL update

UPDATE table
SET column1 = expression1,
    column2 = expression2,
    ...
    column_n = expression_n
[WHERE conditions];