for update in oracle 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: update table syntax in oracle

{
    UPDATE table-Name [[AS] correlation-Name]
        SET column-Name = Value
        [ , column-Name = Value} ]*
        [WHERE clause] |
    UPDATE table-Name
        SET column-Name = Value
        [ , column-Name = Value ]*
        WHERE CURRENT OF
}