INNER JOIN后从多个表中获取最大日期 | JOIN后从多个表中获取最大日期

本文介绍了INNER JOIN后从多个表中获取最大日期的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有两个以下表格

table 1)
ID |  HOTEL ID | NAME 
1       100      xyz 
2       101      pqr
3       102      abc


table 2)
ID | BOOKING ID | DEPARTURE DATE | AMOUNT
1         1       2013-04-12        100
2         1       2013-04-14        120
3         1       2013-04-9          90
4         2       2013-04-14        100
5         2       2013-04-18        150
6         3       2013-04-12        100

我想在mysql中进行修复，以使其从表2中的行中取出MAX DEPARTURE DATE.

I want to get reault in mysql such that it take the row from table two with MAX DEPARTURE DATE.

ID | BOOKING ID | DEPARTURE DATE | AMOUNT
2         1       2013-04-14        120
5         2       2013-04-18        150
6         3       2013-04-12        100

推荐答案

SELECT  b.ID,
        b.BookingID,
        a.Name,
        b.departureDate,
        b.Amount
FROM    Table1 a
        INNER JOIN Table2 b
            ON a.ID = b.BookingID
        INNER JOIN
        (
            SELECT  BookingID, MAX(DepartureDate) Max_Date
            FROM    Table2
            GROUP   BY BookingID
        ) c ON  b.BookingID = c.BookingID AND
                b.DepartureDate = c.Max_date

SQLFiddle演示

SQLFiddle Demo

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