從2個表中選擇並得到1個表的結果2

Question

我有2個表，表2包含很多商店的地址。表2由Shop_ID 參考表1我想選擇那樣[請參閱圖片] 請幫助我！

Answer 1

你可以使用row_number()：

select shop_id, 
    shop_name, 
    shop_address 
from 
(
    select t1.shop_id, 
    t1.shop_name, 
    t2.shop_address, 
    row_number() over(partition by t1.shop_id 
         order by t1.shop_name, t2.shop_address) rn 
    from table_1 t1 
    inner join table_2 t2 
    on t1.shop_id = t2.shop_id 
) src 
where rn = 1 

看到一個demo on SQL Fiddle

您還可以使用聚合函數：

select t1.shop_id, 
    t1.shop_name, 
    max(t2.shop_address) shop_address 
from Table1 t1 
inner join table2 t2 
    on t1.shop_id = t2.shop_id 
group by t1.shop_id, t1.shop_name 

見SQL Fiddle with Demo