问题:

SELECT * from campaigns WHERE id not in
(SELECT 
    e.id_campaign, d.name, d.frequency, d.country, d.referral, d.bid, d.status, COUNT(e.id) AS countcap  
    FROM campaigns d
    LEFT JOIN served e
    ON d.id = e.id_campaign 
    WHERE 
        d.status = \'Active\'
    GROUP BY e.id_campaign
    HAVING
        countcap < d.frequency)

I get the error \"Operand Should Contain 1 Column\" - but I need the COUNT(e.id)

回答1:

There\'s always this:

select *
from campaigns 
where id not in (
    select id_campaign from (
        select e.id_campaign as id_campaign, d.frequency, e.id
        from campaigns d left join served e on d.id = e.id_campaign
        where d.status = \'Active\'
        group by e.id_campaign 
        having count(e.id) < d.frequency 
    )
)

回答2:

The \'not in\' clause expects a list of values. So, a query such as the following will work:

SELECT * from campaigns WHERE id not in
(SELECT 
    e.id_campaign
    FROM campaigns d
    LEFT JOIN served e
    ON d.id = e.id_campaign 
    WHERE 
        d.status = \'Active\'
    GROUP BY e.id_campaign
    HAVING
        COUNT(e.id) < d.frequency)

If you can tell us the structure of tables and what you want to select, we\'ll be able to figure out the right query for you.