MySQL條款與相關的查詢不起作用

Question

我有一個問題，在我有條款。我想要兩個總和之間的比較具有相同的出價，但不同的SENS領域 我得到這樣的輸出：

SELECT v.bid 
FROM v1 v 
WHERE sens = 'c' 
GROUP BY bid 
HAVING Sum(mont) < (SELECT Sum(l.mont) 
        FROM v1 l 
        WHERE sens = 'd' 
          AND l.bid = v.bid group by l.bid); 

ERROR 1054（42S22）：在野外現場「v.bid未知list`

編輯：V1是一個視圖，我用別名L及v試圖靈子查詢主查詢

對不起球員感謝大家對你的答案，我有一個問題wuth原始表中的列現在它解決了:)

Answer 1

不需要兩個選擇從該表中，你可以使用CASE EXPRESSION用於此目的：

SELECT v.bid FROM v1 v 
GROUP BY v.bid 
HAVING SUM(CASE WHEN v.sens = 'c' THEN v.mont ELSE 0 END) < 
     SUM(CASE WHEN v.sens = 'd' THEN v.mont ELSE 0 END) 
    AND COUNT(CASE WHEN v.sens = 'c' THEN 1 END) > 0 

Answer 2

在子查詢的別名是不可見的/可讓你獲得和列沒有發現錯誤，但是可以重構缺乳這樣

select v.bid, t.tot 
     from v1 v 
    Join (
     select bid, sum(mont) tot 
     from v1 
     where sens = 'd' 
     group by bid 
     ) t on t.bid = v.bid 
    where v.sens = 'c' 
    and v.bid < tot 

Answer 3

我與列的可見性的問題，因爲有人不恰當地宣佈，我道歉的傢伙：「（我很內疚:(

腳本：

mysql> select * from op; 
+------+------+------+------+ 
| bid | cid | sens | mont | 
+------+------+------+------+ 
| 1 | 1 | c | 2000 | 
| 1 | 1 | c | 2000 | 
| 1 | 1 | c | 2000 | 
| 1 | 1 | c | 2000 | 
| 1 | 2 | c | 2000 | 
| 1 | 3 | c | 2000 | 
| 2 | 3 | c | 2000 | 
| 1 | 1 | d | 2000 | 
| 2 | 3 | d | 4000 | 
+------+------+------+------+ 
9 rows in set (0.00 sec) 


create view v1 as (select bid , cid , sens , sum(mont) as sumcli from op group by bid,cid,sens); 

mysql> select * from v1 ; 
+------+------+------+--------+ 
| bid | cid | sens | sumcli | 
+------+------+------+--------+ 
| 1 | 1 | c | 8000 | 
| 1 | 1 | d | 2000 | 
| 1 | 2 | c | 2000 | 
| 1 | 3 | c | 2000 | 
| 2 | 3 | c | 2000 | 
| 2 | 3 | d | 4000 | 
+------+------+------+--------+ 
6 rows in set (0.00 sec) 

mysql> SELECT v.bid 
    -> FROM v1 v 
    -> WHERE sens = 'c' 
    -> group by v.bid 
    -> HAVING Sum(v.sumcli) < (SELECT Sum(l.sumcli) 
    ->      FROM v1 l 
    ->      WHERE sens = 'd' 
    ->       AND l.bid = v.bid group by l.bid); 
+------+ 
| bid | 
+------+ 
| 2 | 
+------+ 
1 row in set (0.00 sec)