我试图总结这些表格,我可以指出我错做什么。
我的第一个表是:
Reserve
ReserveID MembershipID PlayerCount Time CourseID
我的第二次会议
Courses
CourseID Name
我刚才所试图的 statement言在这里:
Select Sum(Reserve.Player_Count)Total
From Reserve
Left Join Courses
On Courses.CourseID = Reserve.ReserveID
Where Time = "2012-04-09 07:10:00"
And Courses.Name = "Lake" (or I had Courses.CourseId = "1")
你们似乎混杂了别处。 避免这种情况
Select Sum(Reserve.Player_Count)Total
From Reserve
Left Join Courses
On Courses.CourseID = Reserve.ReserveID
Where Reserve.Time = "2012-04-09 07:10:00"
-- ^ Right here
And Courses.Name = "Lake" (or I had Courses.CourseId = "1")
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