Question

此查询选择所有拥有＆＃34; user_expire＆＃34;的用户。行＆＃34; B1month＆＃34;。

$oneMonthUsersData = mysql_query("SELECT username,email FROM user WHERE DATEDIFF(NOW(),date_created) > 30 AND user_expire = 'B1month'");
while ($oneMonthUsers = @mysql_fetch_array($oneMonthUsersData)) {
    $deletedUsers = $deletedUsers.",".$oneMonthUsers['username'];
    $deletedUsersEmails[] = $oneMonthUsers['email'];
}

如何格式化语法如果我希望同样的查询也选择所有拥有＆＃34; user_expire＆＃34;排＆＃34; C1month＆＃34;以及那些拥有＆＃34; B1month＆＃34;？

的人

Answer 1

您是否尝试过以下查询：

SELECT username,email FROM user WHERE DATEDIFF(NOW(),date_created) > 30 AND (user_expire = 'B1month' OR user_expire = 'C1month')

Answer 2

SELECT username, email 
FROM user 
WHERE DATEDIFF(NOW(),date_created) > 30 
     AND user_expire IN('B1month', 'C1month')

OR

SELECT username, email 
FROM user 
WHERE DATEDIFF(NOW(),date_created) > 30 
     AND (user_expire = 'B1month' OR user_expire = 'C1month')

但是第一个代码有更好的性能，我认为

两种类型的用户的相同查询语法

2 个答案: