Question

我创建了一个查询以删除MariaDB中的某些记录

查询：

DELETE 
FROM
    HrAttLogsFormatted 
WHERE
    DateIn = '2019-04-10' 
    AND Late != '' 
    AND ( FingerId, CreatedDate ) IN (
    SELECT
        FingerId,
        MAX( CreatedDate ) 
    FROM
        HrAttLogsFormatted 
    WHERE
        DateIn = '2019-04-10' 
        AND Late != '' 
        AND FingerId IN ( SELECT FingerId FROM HrAttLogsFormatted WHERE DateIn = '2019-04-10' AND Late != '' GROUP BY FingerId HAVING COUNT( FingerId ) > 1 ) 
    GROUP BY
    FingerId 
)

结果：

表'HrAttLogsFormatted'被指定了两次，都作为目标 “删除”并作为数据的单独来源

但是对于我未成功进行的查询，有没有解决的方法？

提前谢谢

[EDIT-SOLVED]只需应用和查询即可解决

DELETE t1
FROM HrAttLogsFormatted t1
INNER JOIN
(
    SELECT FingerId, MinCreatedDate
    FROM
    (
        SELECT FingerId, MIN(CreatedDate) AS MinCreatedDate
        FROM HrAttLogsFormatted 
        WHERE DateIn = '2019-05-03' AND Late != ''
        GROUP BY FingerId HAVING COUNT(FingerId) > 1
    ) x
) t2
    ON t1.FingerId = t2.FingerId AND t1.CreatedDate = t2.MinCreatedDate;

Answer 1

我会尝试将其写为删除联接：

DELETE t1
FROM HrAttLogsFormatted t1
INNER JOIN
(
    SELECT FingerId, MIN(CreatedDate) AS MinCreatedDate
    FROM HrAttLogsFormatted 
    WHERE DateIn = '2019-04-10' AND Late != ''
    GROUP BY FingerId
    HAVING COUNT(FingerId) > 1
) t2
    ON t1.FingerId = t2.FingerId AND t1.CreatedDate = t2.MinCreatedDate;

如果您真的想继续使用当前查询，则可以通过在WHERE IN子句周围添加一个附加子查询来使其正常工作：

AND (FingerId, CreatedDate) IN (
    SELECT FingerId, MinCreatedDate
    FROM
    (
        SELECT FingerId, MIN(CreatedDate) AS MinCreatedDate
        FROM HrAttLogsFormatted
        ...
    ) x )

但是，我会使用我给的版本，因为它更简单。

在MariaDB中为“ DELETE”指定了两次表

1 个答案: