There is a mistake in the following section:
does not generate what is told in the page, which is
=> SELECT * FROM clients LIMIT 5, 30
but instead, the following is generated and should be there (at least
=> SELECT * FROM clients LIMIT 5 OFFSET 30
By way, if not using OFFSET, the correct would be LIMIT 30, 5 and not
LIMIT 5, 30, anyway.