Question

我是新來編寫檢查多個表的更大的查詢。我有這個SELECT查詢效果很好：

$sql = mysql_query("UPDATE companies SET name='$name',address='$address',city='$city',state='$state',zip='$zip' WHERE email='$email' UNION UPDATE users SET name='$name',address='$address',city='$city',state='$state',zip='$zip' WHERE email='$email'") or die(mysql_error()); 

我在做什麼錯：

$result = mysql_query("SELECT * FROM companies WHERE email='$email' UNION SELECT * FROM users WHERE email='$email'") or die(mysql_error()); 

但是，我用這UPDATE查詢不工作做編輯頁面？

Answer 1

無法將聯合更新語句放在一起。您只需將其分割成單獨的命令。換句話說，運行兩個查詢，一個用於公司，另一個用於用戶。

Answer 2

根據你的問題，你可以用兩個更新來更新

$sql1="UPDATE companies SET name='$name',address='$address',city='$city',state='$state',zip='$zip' WHERE email='$email'"; 
$sql2="UPDATE users SET name='$name',address='$address',city='$city',state='$state',zip='$zip' WHERE email='$email"; 

OR

您可以選擇並在其中找到$電子郵件存在的表。

sql1="select name form user where email=$email " 
sql2="select name form companies where email=$email " 
if(count($sql1>0)){ 
UPDATE user SET name='$name',address='$address',city='$city',state='$state',zip='$zip' WHERE email='$email' 
} 
if(count($sql2>0)){ 
UPDATE companies SET name='$name',address='$address',city='$city',state='$state',zip='$zip' WHERE email='$email' 
}