轉換的SQL Server使用TOP

Question

我得到一個錯誤MySQL的內部連接錯誤「選擇頂層（20）L.load_Number」：

INSERT INTO Last_20_Loads 
SELECT  top (20) L.load_Number, count(b.Bales_Per_Hour) AS COUNT_Bales_Per_Hour, sum(b.Bales_Per_Hour) AS SUM_Bales_Per_Hour 
FROM Loads AS L INNER JOIN 
    Bales AS B ON L.Load_Number = B.Load_Number 
where (status = 7) 
GROUP BY l.load_Number 
ORDER BY l.load_Number DESC; 

爲什麼我收到錯誤。怎麼修？

感謝，

傑裏

Answer 1

的TOP的euivalent是在MySQL LIMIT。

INSERT INTO Last_20_Loads 
SELECT L.load_Number, 
     count(b.Bales_Per_Hour) AS COUNT_Bales_Per_Hour, 
     sum(b.Bales_Per_Hour) AS SUM_Bales_Per_Hour 
FROM Loads AS L 
     INNER JOIN Bales AS B 
      ON L.Load_Number = B.Load_Number 
where (status = 7) 
GROUP BY l.load_Number 
ORDER BY l.load_Number DESC 
LIMIT 20; 

Answer 2

MySQL使用LIMIT而不是TOP。您還應該在您的INSERT語句中指定您的列名稱

INSERT INTO Last_20_Loads (load_number, countbales, sumbales) 
SELECT L.load_Number, count(b.Bales_Per_Hour) AS COUNT_Bales_Per_Hour, sum(b.Bales_Per_Hour) AS SUM_Bales_Per_Hour 
FROM Loads AS L INNER JOIN 
Bales AS B ON L.Load_Number = B.Load_Number 
where (status = 7) 
GROUP BY l.load_Number 
ORDER BY l.load_Number DESC 
LIMIT 20;