Question

我正在尝试在表格中找到所有year和caseseqnumbers，其中类型不是上诉人Rep 1.错误来自于year和{{1表中可以有很多行。这就是我的尝试：

caseseqnumber

任何帮助？！

Answer 1

为什么你需要在那里进行嵌套搜索。只有在检查多个~~数据库~~表中的内容时才需要嵌套搜索。

坚持

select caseqnumber,year from caseparticipants where paticipanttype <> 'Appellant Rep 1'

（＆lt;＆gt;是NOT EQUAL TO的sql子句）

Answer 2

Select 
    caseseqnumber, 
    year 
from 
    caseparticipants 
where 
    participanttype != 'Appellant Rep 1'

Answer 3

为什么不尝试直接在主查询中使用WHERE条件而不是使用子查询？

SELECT caseseqnumber, year 
  FROM caseparticipants 
 WHERE participanttype != 'Appellant Rep 1'

Answer 4

您可以使用LEFT JOIN加入caseparticipants。如果联接没有成功，则意味着caseseqnumber和year没有participanttype = 'Appellant Rep 1'行：

SELECT
  c1.caseseqnumber, 
  c1.year 
FROM 
  caseparticipants c1 LEFT JOIN caseparticipants c2
  ON c1.year=c2.year AND c1.caseseqnumber=c2.caseseqnumber
     AND c2.participanttype = 'Appellant Rep 1'
WHERE
  c2.year IS NULL

修改

要比较caseseqnumber，year和具有“Appellant Rep 1”类型的组合数量的不同组合的数量，您可以使用此SQL Server查询：

SELECT COUNT(DISTINCT CAST(c1.caseseqnumber AS VARCHAR) + '-' + CAST(c1.year AS VARCHAR)), COUNT(DISTINCT CAST(c2.caseseqnumber AS VARCHAR) + '-' + CAST(c2.year AS VARCHAR)) FROM caseparticipants c1 LEFT JOIN caseparticipants c2 ON c1.year=c2.year AND c1.caseseqnumber=c2.caseseqnumber AND c2.participanttype = 'Appellant Rep 1'

Answer 5

如果您希望所有案件都有上诉人但不是代表：

Select caseseqnumber, year
from caseparticipants cp1
where not exists (Select null
                  from caseparticipants cp2
                  where cp2.participanttype = 'Appellant Rep 1'
                  and cp1.caseseqnumber = cp2.caseseqnumber
                  and cp1.year = cp2.year
)

存在SQL语句

5 个答案: