如何在SQL Server 2014中的同一张表中用总和列更新列？

Question

表数据之前：

-----------------------
|ID |WORK|VALUE|TOTAL|
-----------------------
|ID1|WRITE  |10 |   |
|ID1|TYPE   |5  |   |
|ID2|READ   |25 |   |
|ID2|SCAN   |30 |   |
|ID3|PRINT  |15 |   |
|ID4|SETTING|20 |   |
|ID5|REPAIR |5  |   |
|ID5|MAINTE |25 |   |
|ID5|MONITOR|20 |   |

总计是来自相同ID的总和

ID1     10+5
ID2     25+30
ID3     15
ID4     20
ID5     50

现在，我将insert方法与create table data2（ID，TOTAL）一起使用

INSERT INTO DATA2(DATA2.ID, DATA2.TOTAL)
    SELECT DATA.ID, SUM (DATA.VALUE) AS TOTAL
    FROM DATA
    GROUP BY DATA.ID

然后我SELECT JOIN FROM DATA2 AND DATA

后表数据

-----------------------
|ID |WORK|VALUE|TOTAL|
-----------------------
|ID1|WRITE  |10 |15 |
|ID1|TYPE   |5  |15 |
|ID2|READ   |25 |55 |
|ID2|SCAN   |30 |55 |
|ID3|PRINT  |15 |15 |
|ID4|SETTING|20 |20 |
|ID5|REPAIR |5  |50 |
|ID5|MAINTE |25 |50 |
|ID5|MONITOR|20 |50 |

Answer 1

要将总计值更新为表，您需要具有该列。

alter table tblname
add total int

如果这不是一次性的方法，我建议创建如下所示的视图

create view somename
as
    select id,work,value,
    sum(value) over (partition by id ) as total
    from tabel

如果您想一次更新表

;with cte
as
(select id,work,value,
sum(value) over (partition by id ) as total1
from tablename
)
update t
set t.total=c.total1
from cte c
join tablename t
on t.id=c.id

Answer 2

更新总数的另一种方法。

UPDATE T1
SET T1.TOTAL=T2.TOTAL
FROM YOUT_TABLE T1
JOIN (
SELECT ID,SUM(VALUE) AS  TOTAL
FROM YOUR_TABLE 
GROUP BY ID
) T2 ON T1.ID=T2.ID

演示