获取最新的日期从两个表

Question

我有两个表

表1：

______ID_______|_______serials______|____Date_____|__include__ 
      20  |   1123  | 22-05-2014| yes 
      20  |   2231  | 12-06-2013| No 
      21  |   3213  | 24-01-2014| yes 
      22  |   5123  | 27-10-2012| yes 
      20  |   1213  | 02-03-2014| yes 

表2：

______ID_______|______serials_______|____Date_____|__Rma__ 
      1  |   1123  | 01-05-2014| 1 
      2  |   2231  | 22-06-2014| 7 
      3  |   3353  | 20-01-2013| 5 
      4  |   1213  | 27-03-2014| 2 
      5  |   5123  | 06-03-2014| 9 

我需要匹配的连续的两个表中的数据，需要从两张表中拉近日期。 这就是我期待的输出

_____ID_______|_______serials______|__RecentDate_|__include__|__ID__|__serial__|__Rma__ 
    20  |   1123  | 22-05-2014| yes | 1 | 1123 | 1 
    20  |   2231  | 22-06-2014| No  | 2 | 2231 | 7 
    20  |   1213  | 27-03-2014| yes | 4 | 1213 | 2 
    22  |   5123  | 06-03-2014| yes | 5 | 5123 | 9 

任何人都可以帮助我。

Answer 1

SELECT t1.id, t1.serials, 
     CASE WHEN t1.date > t2.date THEN t1.date ELSE t2.date END recentDate, 
     t1.include, t2.id, t2.serials, t2.rma 
FROM table1 t1 
JOIN table2 t2 
ON  t2.serials = t1.serials 

Answer 2

简单连接或内部连接的基本sql。

select * 
from table_1 a, table_2 b 
where a.serials = b.serials; 

要获得使用order by

select * 
from table_1 a, table_2 b 
where a.serials = b.serials 
order by a.date; 

Answer 3

Select t.id,serials,s.Date,include,t1.id,t1.serials 
from table1 t 
join table2 t1 
on t.serials = t1.serials 
join(

Select Serials,max(Date) 'date' 
from (
     Select Serials ,DATE 
     from table1 
     union all 
     Select Serials ,DATE 
     from table2 

     ) 
group by serials   
) s on t.serials = s.serials