mysql 查询结果获取同一id上的一条记录

Question

Hi looking to see how would i write the mysql statement that result in one record if there have same id.

I have two tables order_userinfos and orders, here my join statement

SELECT *
  FROM col_order_userinfos i
  JOIN col_orders o
    ON i.col_order_id = o.order_number
 WHERE o.order_number > 226690

The results came out like this

col_order_userinfo_id   virtuemart_order_id virtuemart_user_id  address_type
   51548                 226691                2611                BT
   51549                 226691                2611                ST
   51550                 226692                2611                BT
   51551                 226692                2611                ST
   51552                 226693                2611                BT
   51553                 226693                2611                ST
   51554                 226694                2611                BT

As you can see, I get same order_id result twice with the address_type either 'ST' OR 'BT' also, I have one order_id that have one order_id and address_type 'BT'.

Here the result i am looking for

col_order_userinfo_id   virtuemart_order_id virtuemart_user_id  address_type
     51549               226691                2611                ST
     51551               226692                2611                ST
     51553               226693                2611                ST
     51554               226694                2611                BT

I tried with group by order_id in my query, the results will only show up with address_type 'BT'. What would be the best way to write mysql statement that get my desire result?

Answer 1

I believe you can use ROW_NUMBER() function like

SELECT col_order_userinfo_id,
      virtuemart_order_id,
      virtuemart_user_id,
      address_type
FROM (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY i.col_order_userinfo_id 
                         ORDER BY i.col_order_userinfo_id DESC) AS row_num
  FROM col_order_userinfos i
  JOIN col_orders o
    ON i.col_order_id = o.order_number
 WHERE o.order_number > 226690 ) xx
WHERE row_num = 1