mysql - 使用 where 子句从 MySQL 中选择随机条目

Question

我现在有这个解决方案:

rs = lState.executeQuery("SELECT FLOOR(RAND() * COUNT(*)) 
        FROM bases 
        WHERE user_id = " + userId + " AND is_valid = 1");

rs.next();
count = rs.getInt(1);

rs = lState.executeQuery("SELECT id, server, server_port, server_ssl,
        server_starttls, server_auth, email, password, auth_wholemail 
         FROM bases LIMIT " + count + ", 1");

但它不起作用，因为 FLOOR(RAND() * COUNT(*)) 没有返回 id 且 is_valid = 1。那么如何使用where子句(where is_valid = 1)从MySQL中快速选择随机条目呢？

Answer 1

尝试使用 ORDER BY 子句。试试这个:

  SELECT COUNT(user_id) FROM bases WHERE user_id = " + userId + " AND is_valid = 1 ORDER BY RAND() LIMIT 1

这将从表中随机返回一行。