Question

我尝试使用此命令将tblDoXang中的所有记录插入到满足条件的tblDoXang1中：

insert into gtse.tblDoXang1
SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
 -- where accountID = 'anhtuaniphone' and deviceID = '14C-10152'
-- and from_unixtime(thoiGian) between '2014-11-01 00:00:02' and '2014-11-17 23:59:59'
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)));

它向我显示了消息：7432 row(s) affected。之后，我使用此查询检查新表（tblDoXang1）中的数据：

SELECT from_unixtime(thoiGian), nhienLieu
FROM `gtse`.`tblDoXang1`

然后我看到：7432 row(s) returned。我还检查了旧表（tblDoXang）的条件：

SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
 -- where accountID = 'anhtuaniphone' and deviceID = '14C-10152'
-- and from_unixtime(thoiGian) between '2014-11-01 00:00:02' and '2014-11-17 23:59:59'
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)));

它也返回了7432行。但是，当我使用特定值进行测试时，我收到了两个不同的结果（我预计它们是相同的）。此查询返回了两条记录（我从新表中选择）：

select from_unixtime(thoiGian), nhienLieu
from gtse.tblDoXang1
where
(from_unixtime(thoiGian) between '2014-10-01 00:00:02' and '2014-11-18 23:59:59')
and accountID = 'vinhnghia' 
and deviceID = '14C-00263'

虽然这会抛出5条记录（条件相同）（我从旧表中选择我在上面第一个查询中插入的条件）：

SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
        where accountID = 'vingnghia' and deviceID = '14C-00263'
       and from_unixtime(thoiGian) between '2014-10-01 00:00:02' and '2014-11-18 23:59:59'
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)));

我对这个结果感到困惑，我不确切地知道我错在哪里，所以有人可以给我一些建议吗？提前谢谢。

Answer 1

我发现了自己的错误。在此查询中：

SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
 -- where accountID = 'anhtuaniphone' and deviceID = '14C-10152'
-- and from_unixtime(thoiGian) between '2014-11-01 00:00:02' and '2014-11-17 23:59:59'
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)));

我没有指定时间，帐户ID和设备ID。它与以下不同：

SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
        where accountID = 'vingnghia' and deviceID = '14C-00263'
       and from_unixtime(thoiGian) between '2014-10-01 00:00:02' and '2014-11-18 23:59:59'
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)));

我具体在哪里条件。所以查询：

select from_unixtime(thoiGian), nhienLieu
from gtse.tblDoXang1
where
(from_unixtime(thoiGian) between '2014-10-01 00:00:02' and '2014-11-18 23:59:59')
and accountID = 'vinhnghia' 
and deviceID = '14C-00263'

对应于此：

SELECT from_unixtime(thoiGian), nhienLieu
FROM (
SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)))
) as t
where accountID = 'vinhnghia' 
and deviceID = '14C-00263'
and from_unixtime(thoiGian) between '2014-10-01 00:00:00' and '2014-11-18 23:59:59'
order by thoiGian asc;

这就是我从上面的两个查询得到不同结果的原因。

Answer 2

你的想法并不好。请想象一下，您总共有十个帐户。有了这个查询：

SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
 -- where accountID = 'anhtuaniphone' and deviceID = '14C-10152'
-- and from_unixtime(thoiGian) between '2014-11-01 00:00:02' and '2014-11-17 23:59:59'
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)));

您只会在十个帐户的每一小时内收到最大值（nhienLieu），而不是一个帐户（您预期的帐户）。所以这就是为什么结果是两种情况之间的差异的原因：当你特别指定accountID，deviceID和thoiGian以及你在表中选择all时。我认为这个查询将满足你的目标：

SELECT *
FROM `gtse`.`tblDoXang`
where concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), nhienLieu) in
    (select
        concat(date(from_unixtime(thoiGian)), hour(from_unixtime(thoiGian)), max(nhienLieu))
        from gtse.tblDoXang
 -- where accountID = 'anhtuaniphone' and deviceID = '14C-10152'
-- and from_unixtime(thoiGian) between '2014-11-01 00:00:02' and '2014-11-17 23:59:59'
        group by
        date(from_unixtime(thoiGian)),
        hour(from_unixtime(thoiGian)),
        accountID,deviceID);

如果你得到的话，请尝试并告诉我任何问题。

将表中的数据插入到MySQL中的另一个表中，其中包含where条件

2 个答案: