PHP的MySQL添加*到SELECT語句

Question

我怎樣才能讓這樣的事情（添加一些SELECT命令）：

$query = "SELECT a.name,a.surname,b.email,c.phone 
      FROM users as a 
      inner join users_email as b 
      inner join users_phone as c 
      WHERE a.id=b.id AND a.id=c.id"; 

$query .= "ORDER BY a.surname"; 

$result = mysql_query($query,$con); 

結果應該是：

$query = "SELECT a.name,a.surname,b.email,c.phone 
      FROM users as a 
      inner join users_email as b 
      inner join users_phone as c 
      WHERE a.id=b.id AND a.id=c.id 
      ORDER BY a.name"; 

$result = mysql_query($query,$con); 
$row=mysql_num_fields($result) 

...但它給出了一個錯誤：mysql_num_fields（）預計參數1是資源，在布爾C中給出：\ XAMPP便攜\ htdocs中\分貝\ file.php在線路32 ...

Answer 1

要給出space當你concate查詢。

$query = "SELECT a.name,a.surname,b.email,c.phone 
      FROM users as a 
      inner join users_email as b 
      inner join users_telefon as c 
      WHERE a.id=b.id AND a.id=c.id "; 

$query .= " ORDER BY a.prenume"; 
      ^

也有一個練習mysql_error()。

$result = mysql_query($query,$con) or die(mysql_error()); 

注：Please, don't use mysql_* functions in new code。他們不再維護and are officially deprecated。請參閱red box？請改爲了解prepared statements，並使用PDO或MySQLi - this article將幫助您決定哪個。如果您選擇PDO，here is a good tutorial。空間後

WHERE a.id=b.id AND a.id=c.id"; 

所以

Answer 2

它應和

$query .= " ORDER BY a.prenume order(asc/desc)"; 

的

$query .= "ORDER BY a.prenume"; 

insetad，你需要之前，爲了給空間BY

Answer 3

添加它應該是：

WHERE a.id=b.id AND a.id=c.id "; 

Answer 4

試試這個：

$query = "SELECT a.name,a.surname,b.email,c.phone 
      FROM users as a 
      inner join users_email as b 
      inner join users_telefon as c 
      WHERE a.id=b.id AND a.id=c.id"; 

$query .= " ORDER BY a.prenume"; 

$result = mysql_query($query,$con); 

一個 '空間' 是單前，需要通過

Answer 5

$query = "SELECT a.name,a.surname,b.email,c.phone 
      FROM users as a 
      inner join users_email as b ON a.id=b.id 
      inner join users_telefon as c ON a.id=c.id 
      ORDER BY a.name";