尝试仅获取选定月份的输出

Question

我需要修改以下查询以仅生成4月份的结果（需要获得总数），但不确定如何进行。我已经尝试过使用运营商之间的日期，但查询仍然显示其他月份。

select ce.CreatedDate, 
msf.SentDate, 
msf.CreatedDate, 
cl.CreatedDate 
from ClientEnrollment(nolock) ce 

inner join ClientLetter(nolock) cl 
on cl.ClientId = ce.ClientId
left join MailStatusFromMailVendor(nolock) msf 
on msf.ClientLetterId = cl.ClientLetterId
where EnrolledById = 3 
and cl.LetterTypeId = 1 
and ce.CreatedDate < isnull(msf.SentDate, getdate())
and msf.SentDate is not null 
--and msf.SentDate is null 
and ce.IsActive = 1 
and cl.IsActive = 1 
order by msf.SentDate, ce.CreatedDate

Answer 1

select ce.CreatedDate, msf.SentDate, msf.CreatedDate, cl.CreatedDate 
from ClientEnrollment(nolock) ce 
    inner join ClientLetter(nolock) cl 
        on cl.ClientId = ce.ClientId
    left join MailStatusFromMailVendor(nolock) msf o
        n msf.ClientLetterId = cl.ClientLetterId
where EnrolledById = 3 and cl.LetterTypeId = 1 
and ce.IsActive = 1 and cl.IsActive = 1 
and ce.CreatedDate between '2019-04-01' and '2019-04-30'
and msf.SentDate between '2019-04-01' and '2019-04-30'
and msf.SentDate is not null 
order by msf.SentDate, ce.CreatedDate