mysql query does not work

-2

SELECT projects.projects_id, 
     projects.projects_title, 
     projects.projects_cost 
    FROM projects 
     LEFT JOIN invoice 
      ON invoice.projects_id = projects.projects_id 
     LEFT JOIN project_assign 
      ON project_assign.projects_id=projects.projects_id 
WHERE project_assign.assigned_user_id=3 
     AND (SUM(invoice.invoice_amount) < projects.projects_cost 
      OR invoice.projects_id is null) 
     AND project_assign.project_completed_date IS NOT NULL

在此查詢我要選擇所有的行是：

沒有出現在例如其他表（在我的情況等表「發票」）

或者，如果persent那麼這個條件必須持有sum(invoice.invoice_amount) < projects.projects_cost

感謝。

來源

2014-03-27 Shahabi

那麼問題是什麼。你有錯誤嗎，你沒有得到你想要的結果嗎？你的表格佈局是什麼樣的，你能提供一些虛擬數據嗎？所有這些都將幫助我們理解目前它是一個非常模糊的問題。 –

'sum（invoice.invoice_amount）'在做什麼？ – KrazzyNefarious

我收到此錯誤「SQL錯誤（1111）無效使用組函數」 – Shahabi

select projects.projects_id, projects.projects_title,projects.projects_cost 
from projects 
left join invoice 
on invoice.projects_id = projects.projects_id 
left join project_assign 
on project_assign.projects_id=projects.projects_id 
where project_assign.assigned_user_id=3 and 
((select sum(invoice.invoice_amount) from invoice) < projects.projects_cost or invoice.projects_id is null) 
and project_assign.project_completed_date is not null

來源

2014-03-27 11:24:17

您不能將聚合函數放在where子句中。在這種情況下，您可以使用子查詢進行聚合，然後執行比較：

SELECT p.projects_id, p.projects_title, p.projects_cost 
FROM projects p LEFT JOIN 
    (select i.projects_id, sum(invoice_amount) as invoice_amount 
     from invoice i 
    ) i 
    ON i.projects_id = p.projects_id LEFT JOIN 
    project_assign pa 
    ON pa.projects_id = p.projects_id 
WHERE pa.assigned_user_id = 3 AND 
     (i.invoice_amount < p.projects_cost OR i.projects_id is null) AND 
     pa.project_completed_date IS NOT NULL;

來源

2014-03-27 11:26:27

劃分您的問題。使用UNION。首先使用一個查詢來選擇第一個表中不存在的所有記錄（使用LEFT JOIN），將第二個查詢的結果與第二個查詢的結果相結合，這將使您滿足第二個條件的所有記錄（使用外連接）

//Select all records present in left table 
//union 
//select all records present in both tables matching your condition. 

    SELECT projects.projects_id, 
     projects.projects_title, 
     projects.projects_cost 
    FROM projects 
     LEFT JOIN invoice 
      ON invoice.projects_id = projects.projects_id 
     LEFT JOIN project_assign 
      ON project_assign.projects_id=projects.projects_id 
    WHERE project_assign.assigned_user_id=3 
    AND project_assign.project_completed_date IS NOT NULL 
    UNION 
    SELECT projects.projects_id, 
     projects.projects_title, 
     projects.projects_cost 
    FROM projects 
     INNER JOIN invoice 
      ON invoice.projects_id = projects.projects_id 
     INNER JOIN project_assign 
      ON project_assign.projects_id=projects.projects_id 
    WHERE project_assign.assigned_user_id=3 
    AND (SUM(invoice.invoice_amount) < projects.projects_cost 
    AND project_assign.project_completed_date IS NOT NULL

來源

2014-03-27 11:29:11

mysql query does not work

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