Question

我想检查表ParticipantsDebtor中是否有重复项，将重复项与名称，ParticipantsCode和DateOfBirth Name和ParticipantsCode字段进行比较在ParticipantsDebtor表中，DateOfBirth在ParticipantDebtorDetail表中，我的请求变成了我不知道这是否正确但是很长或者是假的

表ParticipantsDebtor有：

DebtorId
姓名
ParticipantsCode

表ParticipantDebtorDetail有：

DebtorId
DATEOFBIRTH

查询：

SELECT a.ParticipantCode,
       a.Name,
       COUNT(a.DebtorId) AS DuplicateNumber,
       b.DateOfBirth
FROM ParticipantDebtors a WITH (NOLOCK),
     crem.ParticipantDebtorDetail b WITH (NOLOCK)
WHERE a.DebtorId <> b.DebtorId
GROUP BY a.ParticipantCode,
         a.Name,
         b.DateOfBirth
HAVING COUNT(a.DebtorId) > 1

Answer 1

不正确。您需要join个密钥。。。简单规则：从不在FROM子句中使用逗号。始终使用明确的JOIN语法：

SELECT d.ParticipantCode, d.Name, dd.DateOfBirth, COUNT(*) as NumDups
FROM ParticipantDebtors d with(nolock) JOIN
     crem.ParticipantDebtorDetail dd  with(nolock)
     ON d.DebtorId = dd.DebtorId
GROUP BY d.ParticipantCode, d.Name, dd.DateOfBirth
HAVING COUNT(*) > 1;

如果单个债务人可以多次出现在任一表格中，那么您可以将HAVING条件和NumDups的计算替换为：

HAVING COUNT(DISTINCT d.DebtorID) > 1

搜索重复的行

1 个答案: