如何排除HANA中所有列中具有空值的行？

Question

如果某个日期没有销售和购买，我需要省略以下查询的行。我尝试在哪里Concat（Sales，Purchases）<>''并且不是null函数。但是，即使一列为空值，它也会忽略行。这个怎么做。这是我的查询供您参考，

Do
Begin

Declare FromD Date; 
Declare ToD Date;

FromD := '20200201';
ToD := '20200228';

TBLSALES = Select "OINV"."DocDate",Sum("OINV"."DocTotal") as "Sales"
From "TNP_AGE_LIVE"."OINV"
where "OINV"."DocDate" between :FromD and :ToD 
Group by "OINV"."DocDate"
Order by "OINV"."DocDate";


TBLPURCHASE = Select "OPCH"."DocDate",Sum("OPCH"."DocTotal")as "Purchase"
From "TNP_AGE_LIVE"."OPCH"
where "OPCH"."DocDate" between :FromD and :ToD 
Group by "OPCH"."DocDate"
Order by "OPCH"."DocDate";

SELECT to_date(GENERATED_PERIOD_START) as "Date",:TBLSALES."Sales",:TBLPURCHASE."Purchase"
FROM SERIES_GENERATE_TIMESTAMP('INTERVAL 1 DAY', :FromD, :ToD )
Left Join :TBLSALES on :TBLSALES."DocDate"=to_date(GENERATED_PERIOD_START)
Left Join :TBLPURCHASE on :TBLPURCHASE."DocDate" = to_date(GENERATED_PERIOD_START)
/*where concat(:TBLSALES."Sales",:TBLPURCHASE."Purchase")<>''*/;
End

Answer 1

确定，因此您可以使用SERIES_GENERATE_TIMESTAMP获取FromD日期和ToD日期之间的所有日期的列表。为避免不必要的数据类型转换，可以改用SERIES_GENERATE_DATE函数。

然后您使用LEFT OUTER JOIN加入购买TBLPURCHASES和销售TBLSALES。使用表变量是一个不错的选择，但是ORDER BY对于其余处理不是必需的。

[当其他表中的日期不匹配时，从它们中投影的列（:TBLSALES."Sales"和:TBLPURCHASE."Purchase"）将为NULL（不仅仅是空字符串''）。

使用NULL功能可以轻松地测试COALESCE的多列。

一起考虑，我们可以这样编写代码：

do
begin

declare FromD Date := '20200201'; 
declare ToD   Date := '20200228';

   daily_sales = select
                   "DocDate" as "SalesDate"
                   , SUM("DocTotal") as "Sales_SUM"
              from 
                  "TNP_AGE_LIVE"."OINV"
              where 
                  "DocDate" between :FromD and :ToD 
              group by 
                  "DocDate";

   daily_purchases = select
                     "DocDate" as "PurchaseDate"
                    , Sum("DocTotal") as "Purchases_SUM"
                  from 
                      "TNP_AGE_LIVE"."OPCH"
                  where 
                      "DocDate" between :FromD and :ToD 
                  group by 
                     "DocDate";

   select 
        sgd.GENERATED_PERIOD_START as "Date"
      , s."Sales_SUM"
      , p."Purchases_SUM"
   from
          SERIES_GENERATE_DATE('INTERVAL 1 DAY', :FromD, :ToD ) sgd

     left outer join :daily_sales s 
          on s."SalesDate" = sgd.GENERATED_PERIOD_START

     left Join :daily_purchases p
          on p."PurchasesDate" = sgd.GENERATED_PERIOD_START
   where 
       coalesce(p."SalesDate", p."PurchasesDate") IS NOT NULL;

end;