カウントと左結合によるSQLクエリ

Question

私は2つのテーブルから 'userID'を計算する必要があるクエリがあります。

SQLクエリ：

SELECT DISTINCT TOP 1000 u.id as userID, u.firstName as userFirstName, u.email as userEmail, u.phone as userPhone, 
count(ueo.userID) as opensEmailCounter, count(ush.userID) as opensSmsCounter 
    FROM dbo.Users u 
    LEFT JOIN dbo.UserEmailsOpens ueo ON u.id = ueo.userID AND ueo.targetID = 4 
    LEFT JOIN dbo.UserSmsHistory ush ON u.id = ush.userID AND ush.targetID = 4 AND ush.opened = 1 
    WHERE u.deleted = 0 
    AND IsNull(u.firstName, '') != '' 
    AND IsNull(u.email, '') != '' 
    AND IsNull(u.phone, '') != '' 
GROUP BY u.id, u.firstName, u.email, u.phone 

しかし、結果は私が期待したものではありません。それは私に2番目の左の結合をした後に間違った数を私に与えている。場合によっては2倍の結果となり、同じ結果を表示します（スクリーンショットに添付）。

Answer 1

集計はそうのように参加する前：

select distinct top 1000 
    u.id as userID 
    , u.firstName as userFirstName 
    , u.email as userEmail 
    , u.phone as userPhone 
    , ueo.opensEmailCounter 
    , ush.opensSmsCounter 
from dbo.Users u 
    left join (
    select 
     userID 
     , count(*) as opensEmailCounter 
    from dbo.UserEmailsOpens 
    where targetID = 4 
    group by userID 
    ) ueo 
    on u.id = ueo.userID 
    left join (
    select 
     userID 
     , count(*) as opensSmsCounter 
    from dbo.UserSmsHistory 
    where targetID = 4 
     and opened = 1 
    group by userID 
    ) ush 
    on u.id = ush.userID 
where u.deleted = 0 
    and IsNull(u.firstName, '') != '' 
    and IsNull(u.email, '')  != '' 
    and IsNull(u.phone, '')  != '' 

Answer 2

は、クエリ少し変更されました。結果から空白の数をなくすためにCase Whenを使用しました。

Select userID, userFirstName, userEmail, userPhone, 
sum(case when ueo_userID <> '' then 1 else 0 end) as opensEmailCounter, 
sum(case when ush_userID <> '' then 1 else 0 end) as opensSmsCounter 
from 
(
    SELECT DISTINCT u.id as userID, u.firstName as userFirstName, u.email as userEmail, u.phone as userPhone, 
    ueo.userID as ueo_userID, ush.userID as ush_userID 
    FROM dbo.Users u 
    LEFT JOIN dbo.UserEmailsOpens ueo ON u.id = ueo.userID AND ueo.targetID = 4 
    LEFT JOIN dbo.UserSmsHistory ush ON u.id = ush.userID AND ush.targetID = 4 AND ush.opened = 1 
    WHERE u.deleted = 0user 
    AND IsNull(u.firstName, '') != '' 
    AND IsNull(u.email, '') != '' 
    AND IsNull(u.phone, '') != '' 
) a 
GROUP BY userID, userFirstName, userEmail, userPhone; 

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