mysql - 在 MySQL 查询中使用 DISTINCT、COUNT 和 HAVING

Question

我想计算在给定日期之后总分至少为 300 的所有玩家。我有这个：

SELECT
    COUNT(DISTINCT playerID)
FROM
    table
WHERE
    game_date > '$date'
HAVING
    SUM(points) >= 300

这也包括总和少于 300 分的玩家。我该如何解决这个问题？

Answer 1

为此使用子查询：

SELECT COUNT(*) FROM
(
  SELECT playerID, SUM(points) AS `total`
  FROM `table`
  WHERE game_date > '$date'
  GROUP BY playerID
) tmp
WHERE total>=300

Answer 2

正如 Andre Bossard 所指出的：

要获得所有积分>=300 的玩家的列表：

SELECT * FROM (SELECT playerID, SUM(points) points FROM table WHERE game_date>'$date' GROUP BY playerID) a WHERE points>=300

要获得计数：

SELECT COUNT(*) FROM (SELECT playerID, SUM(points) points FROM table WHERE game_date>'$date' GROUP BY playerID) a WHERE points>=300