WHERE子句錯誤

我試圖在HTML表格中的數據庫中顯示一個特定的值。該聲明是這樣的：（這只是一個例子）WHERE子句錯誤

$sql = "SELECT * FROM tbl_trainings WHERE tbl_trainings.training='Meat Processing'";

我的問題是我有這樣的說法（連接表）：

$sql="SELECT 
tbl_info.id, 
tbl_info.firstname, 
tbl_info.middlename, 
tbl_info.lastname, 
tbl_trainings.id, 
tbl_trainings.training, 
tbl_trainings.info_id 
    FROM tbl_info, tbl_trainings 
    WHERE tbl_info.id = info_id 
    ORDER BY tbl_info.id";

我試圖插入WHERE tbl_trainings.training='Meat Processing'在聲明像這樣：

$sql="SELECT 
tbl_info.id, 
tbl_info.firstname, 
tbl_info.middlename, 
tbl_info.lastname, 
tbl_trainings.id, 
tbl_trainings.training, 
tbl_trainings.info_id 
    FROM tbl_info, tbl_trainings 
    WHERE tbl_info.id = info_id, tbl_trainings.training='Meat Processing' 
    ORDER BY tbl_info.id";

但是我得到了錯誤。錯誤是：

警告：mysql_fetch_array（）預計參數1是資源，在C定的boolean：\ WAMP \ WWW \ CLphpTest \ meatproc.php

任何人都可以請幫我糾正呢？（對不起，仍然是新手）

在此先感謝。

來源

2013-02-22 WATTS

順便說你不應該爲專業程序使用'mysql_'使用'mysqli_'或更好的'PDO'。 – rekire 2013-02-22 14:52:29

**不要**使用http://w3schools.com，因爲信息已過時和誤導。 http://w3fools.com/ – 2013-02-22 15:05:59

你錯過了一個AND而不是逗號其中tbl_info.id = info_id AND tbl_trainings.training ='肉類加工' – 2013-02-22 15:36:04

添加AND/OR，如果你有在查詢多個條件，如

WHERE tbl_info.id = info_id AND 
     tbl_trainings.training='Meat Processing'

爲側沒有，使用加入的新語法，

SELECT tbl_info.id, 
     tbl_info.firstname, 
     tbl_info.middlename, 
     tbl_info.lastname, 
     tbl_trainings.id, 
     tbl_trainings.training, 
     tbl_trainings.info_id 
FROM tbl_info 
     INNER JOIN tbl_trainings 
      ON tbl_info.id = tbl_trainings.info_id 
WHERE tbl_trainings.training = 'Meat Processing' 
ORDER BY tbl_info.id

來源

2013-02-22 14:50:53

感謝它工作正常.. :) – WATTS 2013-02-22 14:56:00

不客氣'： D' – 2013-02-22 14:56:28

Should be "WHERE tbl_info.id = info_id AND tbl_trainings.training='Meat Processing'

來源

2013-02-22 14:52:24

謝謝它工作正常.. :) – WATTS 2013-02-22 14:56:45

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