I have two tables emails and blockedSender I am trying to remove blocked sender from the email query. e.g.
emails table:
| user_id | from_address |
|---|---|
| 1 | name-1 <email-1@address.com> |
| 2 | name-2 <email-2@address.com> |
blockedSender table:
| blocked_address |
|---|
| email-1@address.com |
Here I want to return all elements from the emails table where the from_address does not do a LIKE match with entries in the blocked address. Something similar to
select email_id, from_address
from emails e
where from_address not like in (select '%' + blocked_address + '%'
from blockSenders)
which does not work because of incorrect syntax. Is there any way to do this?
Advertisement
Answer
You can express this using not exists
select e.email_id, e.from_address
from emails e
where not exists (
select * from blockedSenders b
where e.from_address like '%' + b.blocked_address + '%'
)