Sql 查询与 NOT LIKE IN WHERE 子句

Question

I have two tables emails and blockedSender I am trying to remove blocked sender from the email query. eg

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?

Answer 1

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 + '%'
)

Answer 2

It could be rewritten as JOIN :

select e.email_id, e.from_address 
from emails e
left join blockSenders b
  ON e.from_address LIKE '%' + b.blocked_address + '%' 
where b.blocked_address IS NULL;

db<>fiddle demo