Question

我们有一个表，用于从Excel文件中导入数据。

我正在从该表创建视图，将表本身连接起来，并添加一个rownumber列。不幸的是，当我运行sql语句时，又多了两行，我无法弄清楚如何摆脱它们，或者是否有更好的解决方案来添加行号/联接表。

原始表中的每个候选行都有一行yes和no。我试图加入他们的行列，所以在选区/竞赛的同一行中没有出现。

SELECT CAST(ROW_NUMBER() OVER (ORDER BY 
     (SELECT 1)) AS INT) AS ID, t .*
FROM (SELECT DISTINCT 
        a.PRECINCT_NAME, 
        a.CONTEST_FULL_NAME, 
        CAST(a.BALLOT_CAST AS INT) AS 'BALLOT_CAST', 
        a.CANDIDATE_FULL_NAME AS 'CANDIDATE_1', 
        a.PARTY_CODE AS 'PARTY_CODE_1', 
        CAST(a.VOTE_COUNT AS INT) AS 'VOTECOUNT_1', 
        b.CANDIDATE_FULL_NAME AS 'CANDIDATE_2', 
        b.PARTY_CODE AS 'PARTY_CODE_2', 
        CAST(b.VOTE_COUNT AS INT) AS 'VOTECOUNT_2'
    FROM dbo.Election_Special a 
        JOIN dbo.Election_Special b 
            ON a.PRECINCT_NAME = b.PRECINCT_NAME
    WHERE 
        (a.CANDIDATE_FULL_NAME = 'Yes') AND (b.CANDIDATE_FULL_NAME = 'No')
   ) AS t

Actual Output:
PRECINCT NAME | CONTEST FULL NAME | CANDIDATE 1 | VOTE 1 | CANDIDATE 2 | VOTE 2
PRECINCT 1    | CONTEST 1         | YES         | 3      | NO          | 3
PRECINCT 2    | CONTEST 2         | YES         | 6      | NO          | 4
PRECINCT 3    | CONTEST 3         | YES         | 7      | NO          | 5
PRECINCT 4    | CONTEST 1         | YES         | 1      | NO          | 7
PRECINCT 4    | CONTEST 2         | YES         | 6      | NO          | 1
PRECINCT 4    | CONTEST 1         | YES         | 0      | NO          | 0
PRECINCT 4    | CONTEST 2         | YES         | 0      | NO          | 0
PRECINCT 5    | CONTEST 3         | YES         | 3      | NO          | 4


Expected OutPut
PRECINCT NAME | CONTEST FULL NAME | CANDIDATE 1 | VOTE 1 | CANDIDATE 2 | VOTE 2
PRECINCT 1    | CONTEST 1         | YES         | 3      | NO          | 3
PRECINCT 2    | CONTEST 2         | YES         | 6      | NO          | 4
PRECINCT 3    | CONTEST 3         | YES         | 7      | NO          | 5
PRECINCT 4    | CONTEST 1         | YES         | 1      | NO          | 7
PRECINCT 4    | CONTEST 2         | YES         | 6      | NO          | 1
PRECINCT 5    | CONTEST 3         | YES         | 3      | NO          | 4

Answer 1

此刻，您正在“爆炸”您的数据。 1行变成2。

您需要弄清楚表的“自然键”是什么-即每个组合给出1行的列。

我认为这是精确名称和竞赛全名因此您可以通过/拥有...来与一个小组进行测试...

select PRECINCT NAME , CONTEST FULL NAME 
from election_special
group by
PRECINCT NAME , CONTEST FULL NAME 
having count(*) > 1

如果此记录返回0条记录，则说明您已经全部设置好了，您只需将此列添加到自连接中即可

例如：

ON a.PRECINCT_NAME = b.PRECINCT_NAME
and a.CONTEST_FULL_NAME  = b.CONTEST_FULL_NAME

创建视图时尝试连接到同一表时获取额外的行

1 个答案: