將結果與其他表mysql比較

Question

我有2個表我選擇並計數比較項形式2個表，也比較後我需要計算其他表中有多少項包含。

select 
    results.userid, 
    results.amount, 
    results.type, 
    results.counting 
from 
    (SELECT 
     userid, amount, code, count(*) as counting 
    FROM 
     user_buys 
    join star ON (amount >= min_amount) 
    group by type 
    HAVING amount >= 1000) as results 

與見下表

userid |amount  
---------------------- 
    1  | 1000   
    2  | 2000 
    3  | 5500  
    4  | 8200  
    5  | 200  
    6  | 1500 
    7  | 800 

我需要與其他表

min_compare| min_amount | type 
----------------------------------- 
    2   | 1000  | 1star 
    2   | 2000  | 2star 
    3   | 5000  | 3star 
    4   | 8000  | 4star 
    5   | 9000  | 5star 
    6   | 10000  | 6star 
    7   | 11000  | 7star 

，因爲我們必須同步

5 item larger 1000 it contain => 1star 
3 item larger 2000 it contain => 2star 
2 item larger 5000 it contain => 3star 
1 item larger 8000 it contain => 4star 

我預期的結果

rankin 
-------- 
    1star   
    2star 
    3star 
    4star 

我還有一個問題，數開始計數涉及到min_compare，如果我添加了新買的11000就必須有數量少7來計算7star

Answer 1

試試這個;）

select 
    star.type, star.min_amount, t.cnt, t.userids 
from star 
inner join (
    select t1.type, count(t2.userid) as cnt, group_concat(t2.userid order by t2.userid) as userids 
    from star t1 
    inner join user_buys t2 on t1.min_amount <= t2.amount 
    group by t1.type 
) t on t.type = star.type 
order by star.type 

SQLFiddle DEMO HERE

Answer 2

select 
    star.type, star.min_amount, t.cnt, t.userids 
from star 
inner join (
    select t1.type, t1.min_compare, count(t2.userid) as cnt, group_concat(t2.userid order by t2.userid) as userids 
    from star t1 
    inner join user_buys t2 on t1.min_amount < t2.amount 
    group by t1.type 
    HAVING cnt >= t1.min_compare 
) t on t.type = star.type 
order by star.type