set total_fees1 = (select (f.total_Fees2) from fee_Collection f where f.student_Id =minstudent_Id);set total_fees2 = (select (f.total_Fees3) from fee_Collection f where f.student_Id =minstudent_Id);set paid_amount1 = (select (f.paid_amount2) from fee_Collection f where f.s
我当时正在读一本sql书,其中一个问题是:
答案是:FROM Sales.Customers CASE WHEN region IS NULL THEN 1 ELSE 0 END, region;
我可以理解这种想法,但仍然很困惑,例如,让我们使用= 9来记录:因为custid 9有一个空区域,所以在使