MySQL получает всех пользователей, есть ли у них часы?

Question

Попытка получить всех пользователей, есть ли у них часы? Моя LEFT OUTER JOIN до сих пор не работает ..

SELECT tblleaverequest.lqUser, 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 1 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Jan', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 2 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Feb', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 3 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Mar', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 4 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Apr', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 5 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'May', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 6 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Jun', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 7 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Jul', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 8 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Aug', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 9 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Sep', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 10 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Oct', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 11 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Nov', 
     SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 12 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Dec', 
     SUM(tblleaverequest.lqHoursPL) AS PaidLeaveTotal 

FROM  tblusers LEFT OUTER JOIN tblleaverequest ON tblleaverequest.lqUser = tblusers.username  

WHERE  (tblusers.clr_accrual = '1') AND (YEAR(tblleaverequest.lqStartDate) = YEAR(CURDATE())) 
GROUP BY tblusers.username 

Вот мои результаты, но мне нужно, чтобы остальные пользователи без часов тоже.

Answer 1

Не уверен, что о вас дб схемы, но, кажется, вы просто можете переместить одно условие из WHERE к ON п

SELECT tblusers.username, 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 1 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Jan', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 2 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Feb', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 3 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Mar', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 4 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Apr', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 5 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'May', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 6 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Jun', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 7 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Jul', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 8 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Aug', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 9 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Sep', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 10 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Oct', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 11 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Nov', 
    SUM(CASE WHEN DATE_FORMAT(tblleaverequest.lqStartDate, '%m') = 12 THEN (tblleaverequest.lqHoursPL) ELSE 0 END) AS 'Dec', 
    SUM(tblleaverequest.lqHoursPL) AS PaidLeaveTotal 

FROM  tblusers 
LEFT OUTER JOIN tblleaverequest 
ON tblleaverequest.lqUser = tblusers.username  
    AND (YEAR(tblleaverequest.lqStartDate) = YEAR(CURDATE())) 
WHERE  (tblusers.clr_accrual = '1') 
GROUP BY tblusers.username 

Answer 2

WHERE ... (YEAR(tblleaverequest.lqStartDate) = YEAR(CURDATE())) 

Если нет соответствия в записях tblLeaveRequest, то дата будет null. Поскольку null ничего не может сопоставить, эти записи будут удалены. Таким образом, вы, по сути, конвертируете ВНУТРЕННУЮ ПРИСОЕДИНЬЯ НА ВСТУПЛЕНИЕ ВНУТРЕННЕГО ПРИСОЕДИНЕНИЯ. Переместите это сравнение в оператор JOIN, чтобы сохранить OUTER JOIN.

Update:

Не забудьте захватить имя пользователя из tblusers, так как значение tblleaverequest.lqUser может быть нулевым из-за OUTER JOIN.

SELECT tblusers.username 
     , SUM(CASE ......)) AS Jan 
     , ....