In Query Cakephp 2

array(
    "Post.title" => array("First post", "Second post", "Third post")
)

To do a NOT IN(...) match to find posts where the title is not in the given set of values, do the following:

array(
    "NOT" => array(
        "Post.title" => array("First post", "Second post", "Third post")
    )
)