Question

我在MSSQL 2012r2表中具有以下数据：

id   data1  amount
------------------
10   abc     95.00
10   NULL   312.00
20   def     16.00
30   gqi     32.00

预期的查询结果：

id   data1  amount
------------------
10   abc    407.00
20   def     16.00
30   gqi     32.00

仅使用sql可能吗？

Answer 1

使用Window window = yourDialog.getWindow(); if (window != null) { WindowManager.LayoutParams lp = new WindowManager.LayoutParams(); lp.copyFrom(window.getAttributes()); //This makes the dialog take up the full width lp.width = WindowManager.LayoutParams.MATCH_PARENT; lp.height = WindowManager.LayoutParams.MATCH_PARENT; window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); window.setAttributes(lp); }，max()聚合函数和sum()

group by

Answer 2

case when也可以帮助您

select id, case when data1 is null then 'abc' else data1 end
          as data1, sum(amount) from table_name
         group by id,case when data1 is null then 'abc' else data1 end

Answer 3

如果您希望NULL看起来像'abc'，请使用coalesce()：

select id, coalesce(data1, 'abc') as data1,
       sum(amount) as amount
from t
group by id, coalesce(data1, 'abc');

这将创建一个任意的'abc'行（如果不存在）。如果只希望将其与 any 的现有值合并：

select t.id, coalesce(t.data1, t2.data1) as data1,
       sum(t.amount) as amount
from t outer apply
     (select top (1) t2.data1
      from t t2
      where t2.id = t.id and t2.data1 is  not null
     ) t2
group by t.id, coalesce(t.data1, t2.data1);

Answer 4

请尝试这个。

select t1.id, coalesce(t1.data1,t2.data1)
from Table t1 join (select id, sum(amount) from Table group by id) t2 
on t1.id = t2.id

在这里，主要的问题只是如何在多列之间获取非空值。因此我们可以通过 coalesce函数来实现。

什么是合并函数？

COALESCE（）函数返回列表中的第一个非空值。

示例：

SELECT COALESCE（NULL，NULL，NULL，'W3Schools.com'，NULL，'Example.com'）;

执行上述sql查询后，它会返回。

W3Schools.com

第一个不是空值。

https://www.w3schools.com/sql/func_sqlserver_coalesce.asp

Answer 5

选择id，max（data1）data1，sum（amount）数量来自表名按ID分组

Answer 6

select id, COALESCE(data1 ,'anyvalue') as data1, sum(amount) as amount 
from <table>
group by id , COALESCE(data1,'anyvalue')

具有空值的SQL GROUP BY

6 个答案: