從選擇MySQL的選擇

Question

我不知道我在做什麼不對的：

SELECT 
    Cont, COUNT(id) 
FROM (
    SELECT * 
    FROM protable 
    WHERE MATCH (ProdTitulo) AGAINST ('art' IN BOOLEAN MODE) 
) 
GROUP BY Cont; 

問題是，當我嘗試使用上，我得到了獲取數組：「警告：mysql_fetch_array（）期望參數1是資源，布爾給定「

括號內的選擇（第3行）似乎工作正常。

Answer 1

把一個別名子查詢：

SELECT Cont, COUNT(id) 
FROM 
( 
    SELECT * 
    FROM protable 
    WHERE MATCH (ProdTitulo) AGAINST ('art' IN BOOLEAN MODE) 
) AS t -- <---------- You are missing this 
GROUP BY Cont