MySQL選擇語句---顯示所有這些，除非這個---不太確定如何做到這一點

我想創建一個SQL查詢，將選擇顯示的所有內容......但我有一個條件，總小時數！= 0。這有效，但我必須添加一個條件，將排除總小時的條件！= 0。MySQL選擇語句---顯示所有這些，除非這個---不太確定如何做到這一點

基本上，我需要查詢的樣子：AND project_timecard_task_days.total_hours = 0，除非task.type =「固定利率」

因此，「除非」的說法的部分是問題。任何幫助都感激不盡！

SELECT project_timecard_tasks.task_id, 
     project_timecard_tasks.datetime, 
     project_timecard_tasks.total_hours, 
     project_timecard_tasks.user_id, 
     project_timecard_tasks.project_id, 
     users.user_id, 
     users.firstname, 
     users.lastname, 
     users.billingrate, 
     tasks.id, 
     tasks.taskname, 
     tasks.billingoption, 
     tasks.fixedrate, 
     tasks.rate_schedule_id, 
     hourlyrates.rate_schedule_id, 
     hourlyrates.hourlyrate, 
     project_timecard_tasks.project_task_id, 
     project_timecard_task_days.project_task_id, 
     project_timecard_task_days.project_task_day_id, 
     project_timecard_task_days.total_hours, 
     project_timecard_task_days.comments, 
     project_timecard_task_days.invoiced 
FROM project_timecard_tasks 
     JOIN users 
     ON project_timecard_tasks.user_id = users.user_id 
     JOIN tasks 
     ON project_timecard_tasks.task_id = tasks.id 
     JOIN project_timecard_task_days 
     ON project_timecard_tasks.project_task_id = 
      project_timecard_task_days.project_task_id 
     JOIN hourlyrates 
     ON project_timecard_tasks.billing_code_id = hourlyrates.hourly_rate_id 
WHERE project_timecard_tasks.project_id = '$jobNumber' 
     AND project_timecard_task_days.total_hours != 0 
     AND project_timecard_task_days.invoiced != 1

來源

2012-07-30 m_gunns

...AND (project_timecard_task_days.total_hours != 0 OR task.type ="Fixed Rate")...

來源

2012-07-30 15:30:58 NotGaeL

只需使用OR：

WHERE 
(
    project_timecard_tasks.project_id = '$jobNumber' 
    AND 
    project_timecard_task_days.total_hours != 0 
    AND 
    project_timecard_task_days.invoiced != 1 
) 
OR 
    task.type ="Fixed Rate"

或者可能（取決於你如何想你的條件）：

WHERE 
    project_timecard_tasks.project_id = '$jobNumber' 
    AND 
    project_timecard_task_days.invoiced != 1 
    AND 
    (
    project_timecard_task_days.total_hours != 0 
    OR 
    task.type ="Fixed Rate" 
)

來源

2012-07-30 15:30:47 Zbigniew

使用OR聲明。

... 
AND (project_timecard_task_days.total_hours != 0 OR task.type = "Fixed Rate") 
AND...

來源

2012-07-30 15:31:36 Palladium

MySQL選擇語句---顯示所有這些，除非這個---不太確定如何做到這一點

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