Question

我基本上有一个我创建的事务表，用于记录和输出发票。我有一个销售标志（= 1）和购买（= 2）。

我想要一个简单的SQL来按月计算销售和购买量。问题是，如果我从组中删除事务类型（mybooks_trans_class_id_fk）它不起作用，但是如果我把它留在结果中则不是我想要的。

SQL：

       SELECT 
        DATEPART(Year, mybooks_trans_transaction_datetime) as 'sales_year',
        DATEPART(Month, mybooks_trans_transaction_datetime) as 'sales_month',
        case 
        when cast( mybooks_trans_class_id_fk as nvarchar(100))!='1' then cast(sum(mybooks_trans_gross_amount) as nvarchar(100))
        else '0' 
        end as total_sales,

        case 
        when cast( mybooks_trans_class_id_fk as nvarchar(100))!='2' then cast(sum(mybooks_trans_gross_amount) as nvarchar(100))  
        else '0' 
        end as total_purchases         
        from view_mybooks_transactions_all_details 
        GROUP BY DATEPART(Year, mybooks_trans_transaction_datetime), 
        DATEPART(MM, mybooks_trans_transaction_datetime),mybooks_trans_class_id_fk

结果是：

2012     11 0   15300.00

2012     12 0   2500.00

2013    1   0   1300.00

2013    1   600.00  0

2013    2   0   2750.00

2013    2   1500.00 0

但我希望第1个月只能在一行中，所以我想要的结果是

2012    11  0   15300.00

2012    12  0   2500.00

2013    1   600.00  1300.00

2013    2   1500.00 2750.00

有什么建议吗？我的sql能力最好是适度的！

Answer 1

这应该有效:(尽量不要改变太多）

SELECT 
  DATEPART(Year, mybooks_trans_transaction_datetime) as 'sales_year',
  DATEPART(Month, mybooks_trans_transaction_datetime) as 'sales_month',
  SUM(case 
      when mybooks_trans_class_id_fk != 1
      then mybooks_trans_gross_amount
      else 0
      end) as total_sales,
  SUM(case 
      when mybooks_trans_class_id_fk != 2
      then mybooks_trans_gross_amount
      else 0
      end) as total_purchases
FROM view_mybooks_transactions_all_details 
GROUP BY DATEPART(Year, mybooks_trans_transaction_datetime), 
         DATEPART(MM, mybooks_trans_transaction_datetime)

ms sql分组结果查询

1 个答案: