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C list group By sum

SQL:select * from A,B where A.cpID=B.cpID and A.cbID=B.cbID LINQ:var p = from t1 in a from t2 in b from t3 in c where t1.cpid equal t2.cpid and t1.cbid equal t3.cbid select new { t1, t2.cpid } linq 也能实现 sum、groupby 的效果...

select type from A where year=2012 group by type order by score desc 如果有分组的话,查询的列 必须要在分组中

so easy , 直接用linq, from c in datatable group by c.name select c。

不一定的,select a,b,c from table group by a,b,c,d 也是正确的写法。 SQL的grop by 语法为, select 选取分组中的列+聚合函数 from 表名称 group by 分组的列 从语法格式来看,是先有分组,再确定检索的列,检索的列只能在参加分组的列中眩 所...

select top 10 商品编号 = b.goodsId,商品名称 = b.goodsName,销售数量 = sum(c.quantity) from GoodsType a join GoodsInfo b on a.typeId = b.typeId join OrderGoodsInfo c on b.goodsId = c.goodsId where a.typeName = '野营用品'group by ...

1.多表复合查询的话建议做成视图就比较方便,要不然通过linq来处理复合查询是比较麻烦的。 2. SQL:select * from A,B where A.cpID=B.cpID and A.cbID=B.cbID LINQ:var p = from t1 in a from t2 in b from t3 in c where t1.cpid equal t2.cpid...

SUM函数的语法是: 代码如下 复制代码 SELECT SUM(expression ) FROM tables WHERE predicates; 表达式可以是一个数值字段或公式。 简单的例子 例如,你可能想知道合并全体员工的薪金总额美元以上,其薪酬是25,000/年 代码如下 复制代码 SELECT ...

Select TABLE1.x_ID,SUM(TABLE1.x_sale) AS sumsalein FROM table1 WHERE (TABLE1.x_date BETWEEN '"&2009-12-01 &"' AND '"&2009-12-03&"') GROUP BY TABLE1.x_ID union select '总和',sum(table1.x_sale) as sumsalein from table1 where (TAB...

从B表里查询单位、cs的总数,按单位排序,并把结果保存到C表里

这个样子?sqlserver? update a set a.hour=c.hour from a inner join (select id,sum(isnull(hour,0)) hour from b group by id) c on a.id=c.id

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