[英]SQl Statement Sum
嘿伙计们,我正在尝试对这些表格求和,但我无法弄清楚我做错了什么
我的第一张桌子是:
Reserve
ReserveID MembershipID PlayerCount Time CourseID
我的第二张桌子是
Courses
CourseID Name
我正在尝试的 sql 声明在这里:
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")
你好象混了别名。 避开他们
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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