試してみてください
SELECT Email.address
FROM Email LEFT OUTER JOIN DoNotMail on Email.address = DoNotMail.address
WHERE DoNotMail.address is null
サブクエリが不要になります。
試してみてください
SELECT Email.address
FROM Email LEFT OUTER JOIN DoNotMail on Email.address = DoNotMail.address
WHERE DoNotMail.address is null
サブクエリが不要になります。