Question

ID  QuestionNo  AnswerPercent
1    15          10  
1    16          10  
1    17          20
1    18          25
2    15          30
2    16          0
2    17          15
2    18          25

输出

ID  QuestionNo  AnswerPercent
1    15          10  
1    16          30  
1    17          20
1    18          25
2    15          30
2    16          15
2    17          15
2    18          25

对于每个id，问题16和17的答案百分比需要合并到16个。对于某些id，可能没有任何16或17个问题编号。

任何人都可以帮助我。谢谢！

Answer 1

我相信这就是你所追求的，UPDATE，JOIN到子查询：

UPDATE A
SET A.AnswerPercent = B.AnswerPercent
FROM YourTable A
JOIN (SELECT ID, SUM(AnswerPercent)'AnswerPercent'
      FROM YourTable
      WHERE QuestionNo IN ('16','17')
      GROUP BY ID
     )B
ON A.ID = B.ID
WHERE A.QuestionNo = '16'

演示：SQL Fiddle

Answer 2

尝试添加两次表... 作为a别名的表具有除问题17的那些之外的所有行，并且表别名为b的表格包含问题17的行

Select a.Id, a.QuestionNo,
   a.AnswerPercent + 
       case A.QuestionNo When 16 
       then coalesce(b.AnswerPercent, 0) End 
       else 0 End AnswerPercent
From table a 
   left Join table b 
     on a.id = b.Id 
       And a.QuestionNo != 17
       And b.QuestionNo = 17

如果你想要的只是更新现有的表，那么你需要更新和删除。

update a set 
    AnswerPercent = a.AnswerPercent + 
      IsNull(b.AnswerPercent, 0)
from table a 
   left Join table b  
     on a.id = b.Id 
       And a.QuestionNo = 16
       And b.QuestionNo = 17

 --and then ... 

 delete table where QuestionNo = 17

Answer 3

with aaa as(
select sum(AnswerPercent) as AnswerPercent,ID
from Table
where QuestionNo in (16,17)
group by ID)

select * from Table where QuestionNo <> 16
union
select ID, 16, sum
from aaa
order by ID,AnswerPercent

使用SQL将两行的值组合成单行

3 个答案: