mysql，介于和限制之间

Question

我想获取某个日期间隔之间的所有行，结果集最多为50条记录。什么可以查询？我不断收到错误：

$sql = "SELECT DISTINCT userId FROM ".$TableName.
       " where time BETWEEN (NOW() - INTERVAL "
       .$USER_COUNT_DURATION.
       " MINUTE AND NOW())  LIMIT 0, ".$limit." ;";

Answer 1

看起来像括号问题。 “MINUTE AND NOW（））”应该是“MINUTE”和NOW（）“

$sql = "SELECT DISTINCT userId FROM ".$TableName." where time BETWEEN (NOW() - INTERVAL ".$USER_COUNT_DURATION." MINUTE) AND NOW() LIMIT 0, ".$limit." ;";