Prova
SELECT Email.address
FROM Email LEFT OUTER JOIN DoNotMail on Email.address = DoNotMail.address
WHERE DoNotMail.address is null
Den undviker att behöva en underfråga.
Prova
SELECT Email.address
FROM Email LEFT OUTER JOIN DoNotMail on Email.address = DoNotMail.address
WHERE DoNotMail.address is null
Den undviker att behöva en underfråga.