如何选择最新的日期记录并显示mysql中的其他列？

Question

我正在使用 XAMPP MYSQL

我有表，Date 列是字符串

  Date    |  Customer   |   Location   | Cash | Balance |
2015/6/23    LBalance      California    5000    3000
2015/6/25    LBalance      New York      6000    4500
2015/6/25    InHoss Dept.  South Beach   15000   1000
2015/6/20    InHoss Dept.  South Beach   15000   1000
2015/6/17    InHoss Dept.  South Beach   15000   1000
2015/6/22    LBalance      California    5000    4000
2015/6/22    LBalance      New York      6000    6000
2015/6/17    InHoss Dept.  North Beach   18000   1000

如何选择查询每个客户不同地点的最新日期记录？

预期结果：

Date      |  Customer   |    Location   | Cash | Balance |
2015/6/23    LBalance      California    5000    3000
2015/6/25    LBalance      New York      6000    4500
2015/6/25    InHoss Dept.  South Beach   15000   1000
2015/6/17    InHoss Dept.  North Beach   18000   1000

这是我去过的最近的一次：SELECT Customer, Location, Cash, Balance, max(Date) AS “As Of” FROM mytable WHERE Customer = 'LBalance' GROUP BY Customer, Location。虽然它显示的是客户的最近日期，但另一列只是显示他们的第一个结果。

Answer 1

从 xampp 中选择 (*) 其中 date = (select max(date) from xampp)

Answer 2

要获取最新记录，您使用 max() 函数，对于您使用的每个客户和位置分组 检查以下内容：

select max(date) , CUSTOMER, LOCATION from table GROUP BY CUSTOMER , LOCATION

编辑。如果日期是 varchar（逻辑错误），你可以在下面做。

 select Max(cast(date as Date)) , CUSTOMER, LOCATION from table GROUP BY CUSTOMER , LOCATION

Answer 3

因为，您想要一个日期到字符串的转换。但不确定是否需要这样做，因为 max(date) 可能在没有转换的情况下仍然有效。

select max(STR_TO_DATE(Date, '%Y/%m/%d')),Customer, location, cash,balance from YourTable group by Customer, Location

Happy Coding.. 请确认您需要什么。变得难以跟踪编辑。

Answer 4

也许你可以试试这个

select a.*
from yourtable a JOIN
( select Customer,Location,Max(Date) as Mdate
   from yourtable
   group by Customer,Location) b
on a.Customer=b.Customer and a.Location=b.Location and a.Date=b.Mdate

Answer 5

试试看

with cte (date, Customer, Location, Cash , Balance) as
(
select cast('2015/6/23' as datetime) date, 'LBalance' Customer, 'California' Location, 5000 Cash , 3000 Balance
union all
select cast('2015/6/25' as datetime) date, 'LBalance' Customer, 'New York' Location, 6000 Cash , 4500 Balance
union all
select cast('2015/6/25' as datetime) date, 'InHoss Dept.' Customer, 'South Beach' Location, 15000 Cash , 1000 Balance
union all
select cast('2015/6/20' as datetime) date, 'InHoss Dept.' Customer, 'South Beach' Location, 15000 Cash , 1000 Balance
union all
select cast('2015/6/17' as datetime) date, 'InHoss Dept.' Customer, 'South Beach' Location, 15000 Cash , 1000 Balance
union all
select cast('2015/6/22' as datetime) date, 'LBalance' Customer, 'California' Location, 5000 Cash , 4000 Balance
union all
select cast('2015/6/22' as datetime) date, 'LBalance' Customer, 'New York' Location, 6000 Cash , 6000 Balance
union all
select cast('2015/6/27' as datetime) date, 'InHoss Dept.' Customer, 'North Beach' Location, 18000 Cash , 1000 Balance
)

select m.Date, m.Customer, m.Location, m.Cash, m.Balance 
   from cte m
   where m.Date = (select max(mm.Date) 
                     from cte mm 
                    where mm.customer=m.customer
                      and mm.location = m.location )

我已经检查了我的示例，一切正常，请确保您使用的是 mysql 示例