试图选择具有最高TimeStamp值和最低ID值的20个项目？

Question

我正在尝试选择具有20个最高'TimeStamp'值的行，从这20行中选择具有最低ID值的1行：

$result_last = mysql_query("SELECT * FROM (SELECT * FROM Events ORDER BY TimeStamp DESC LIMIT 20) ORDER BY ID ASC LIMIT 1");

以上查询不起作用，但对我来说很有意义。这个查询有问题吗？

Answer 1

错误是#1248 - Every derived table must have its own alias，确实如此。这应该有效：

$result_last = mysql_query("SELECT * FROM (SELECT * FROM Events ORDER BY TimeStamp DESC LIMIT 20) AS T ORDER BY ID ASC LIMIT 1");

Answer 2

尝试这样的事情：

$result_last = mysql_query("SELECT * FROM Events WHERE TimeStamp IN(SELECT TimeStamp FROM Events ORDER BY TimeStamp DESC LIMIT 10") ORDER BY TimeStamp ASC LIMIT 1);