Question

我有很多球员记录，一堆世界纪录，还有一些被禁止的球员：

describe records

+--------+---------------+------+-----+---------+----------------+
| Field  | Type          | Null | Key | Default | Extra          |
+--------+---------------+------+-----+---------+----------------+
| id     | int(11)       | NO   | PRI | NULL    | auto_increment |
| type   | varchar(3)    | NO   | MUL | NULL    |                |
| map    | varchar(31)   | NO   | MUL | NULL    |                |
| authid | varchar(31)   | NO   |     | NULL    |                |
| time   | decimal(13,6) | NO   |     | NULL    |                |
| date   | datetime      | NO   |     | NULL    |                |
+--------+---------------+------+-----+---------+----------------+

describe wrs

+-------------+--------------+------+-----+---------+----------------+
| Field       | Type         | Null | Key | Default | Extra          |
+-------------+--------------+------+-----+---------+----------------+
| id          | int(11)      | NO   | PRI | NULL    | auto_increment |
| map         | varchar(31)  | NO   | MUL | NULL    |                |
| route       | varchar(31)  | NO   |     | NULL    |                |
| time        | decimal(5,2) | NO   |     | NULL    |                |
+-------------+--------------+------+-----+---------+----------------+

describe banned

+--------+-------------+------+-----+---------+----------------+
| Field  | Type        | Null | Key | Default | Extra          |
+--------+-------------+------+-----+---------+----------------+
| id     | int(11)     | NO   | PRI | NULL    | auto_increment |
| authid | varchar(31) | NO   | UNI | NULL    |                |
+--------+-------------+------+-----+---------+----------------+

我正在尝试从time表格中为每个唯一records选择最小map，其中authid（玩家标识符）未在{{1}中找到表格。

我还希望从banned检索相同time的世界记录wrs。

我希望仅在map等于＆＃34;亲＆＃34;时才从map选择authid，time和records但是如果type不等于＆＃34;亲＆＃34;我希望保留map来自time中相应行的唯一地图和wrs列表。

我的问题是在检索最低type / authid时从records表中检索正确/对应的time。我设法做了这样的事情：

map

但它没有考虑被禁止的玩家，因为在选择最小SELECT m.map, minTime, wrTime, wrTime / minTime AS ratio, minTime - wrTime AS diffTime FROM # get all unique maps from records table (SELECT map FROM records GROUP BY map) AS m LEFT JOIN # find min time for each map where type is pro (SELECT type, map, MIN(time) AS minTime FROM records WHERE type = "pro" GROUP BY map) AS p ON m.map = p.map LEFT JOIN # find world record time for each map (SELECT map, MIN(time) AS wrTime FROM wrs GROUP BY map) AS w ON m.map = w.map时我无法检索到正确的authid值（除此之外：我甚至不确定会使用正确的time在where子句中）。如果我有正确的type，我可以轻松地在查询中添加类似以下的内容来忽略被禁玩家：

authid

希望我有道理。如果没有，请询问更多信息。

Answer 1

我不确定我是否完全理解了您的问题，但我认为以下SQL可能会对您有所帮助：

我的问题是在检索最小时间/地图时从记录表中检索正确/相应的authid。 “

SELECT
    map,
    MIN(time) AS minTime
FROM records
WHERE
    authid NOT IN (SELECT authId FROM banned)
GROUP BY map

Answer 2

试试这个，希望我没有误解你的意图。

SELECT
    m.map,
    m.minTime,
    w.wrTime,
    w.wrTime / m.minTime AS ratio,
    m.minTime - w.wrTime AS diffTime
FROM
    records r
    INNER JOIN
    -- get all unique maps from records table
    (SELECT map, MIN(time) AS minTime FROM records WHERE type = "pro" GROUP BY map) m ON r.map = m.map AND r.time = m.minTime
    LEFT JOIN
    -- find world record time for each map
    (SELECT map, MIN(time) AS wrTime FROM wrs GROUP BY map) w ON m.map = w.map
    LEFT JOIN banned b ON r.authid = b.authid
WHERE b.authid IS NULL

Answer 3

对于那些感兴趣的人，这就是我最终解决问题的方法（在Piyg的答案的帮助下）：

SELECT
    m.map,
    p.minTime,
    w.wrTime,
    w.wrTime / p.minTime AS ratio,
    p.minTime - w.wrTime AS diffTime
FROM
    (SELECT
        map
    FROM records
    GROUP BY map) m
LEFT JOIN
    (SELECT
        map,
        MIN(time) AS minTime
    FROM records
    WHERE
        authid NOT IN (SELECT authid FROM banned)
    AND
        type = "pro"
    GROUP BY map) p
ON m.map = p.map
LEFT JOIN
    (SELECT
        map,
        MIN(time) AS wrTime
    FROM wrs
    GROUP BY map) w
ON m.map = w.map

选择未被禁止用户的每个唯一列值的最短时间

3 个答案: