【发布时间】：2021-08-04 15:40:12
【问题描述】：
我在 MySQL 中遇到了一个相当复杂和困难的排名和排行榜问题。
首先，这里是game_instances表结构（条带化）：
+----+---------+---------------------------+--------+-------+-------+---------------------+
| id | user_id | country | region | score | moves | finished_at |
+----+---------+---------------------------+--------+-------+-------+---------------------+
| 1 | 1 | Iran, Islamic Republic Of | Qom | 404 | 71 | 2021-05-14 02:56:10 |
| 2 | 1 | Iran, Islamic Republic Of | Qom | 686 | 138 | 2021-05-14 02:58:13 |
| 3 | 1 | Iran, Islamic Republic Of | Qom | NULL | NULL | NULL |
| 4 | 2 | Iran, Islamic Republic Of | Yazd | 1162 | 194 | 2021-05-14 03:03:00 |
| 5 | 2 | Iran, Islamic Republic Of | Yazd | 220 | 56 | 2021-05-14 03:04:19 |
| 6 | 2 | Iran, Islamic Republic Of | Yazd | 8 | 5 | 2021-05-14 03:05:13 |
| 7 | 2 | Iran, Islamic Republic Of | Qom | 280 | 70 | 2021-05-14 03:06:11 |
| 8 | 2 | Iran, Islamic Republic Of | Qom | NULL | NULL | NULL |
| 9 | 3 | Iran, Islamic Republic Of | Qom | 570 | 107 | 2021-05-14 03:10:26 |
| 10 | 3 | Iran, Islamic Republic Of | Qom | 0 | 0 | 2021-05-14 03:32:40 |
+----+---------+---------------------------+--------+-------+-------+---------------------+
我需要特定用户的排名编号：
- 总分：全球
- 总分：国家
- 总分：地区
- 高分：全球
- 高分：国家
- 高分：地区
还有前 10 名用户的这 6 个细分市场的排行榜。总共剩下 12 个数据集。
我在 StackOverflow 和其他网站上搜索并尝试了很多小时，但都没有成功。目前，我正在使用 12 个单独的查询来获取这些数据，这根本不是一个好习惯，我正在寻找一种方法来尽可能地组合和优化这些查询。
编辑：我使用的是 MySQL 5.7。
这是我当前的实现：
public function leaderboard(Request $request)
{
$user = $request->input('_user');
if (!$user) {
return apiSend(null, 401);
}
$data = [
'total' => [
'player' => [
'score' => 0,
'global_rank' => 0,
'country_rank' => 0,
'region_rank' => 0,
],
'global' => [], 'country' => [], 'region' => [],
],
'high' => [
'player' => [
'score' => 0,
'global_rank' => 0,
'country_rank' => 0,
'region_rank' => 0,
],
'global' => [], 'country' => [], 'region' => [],
],
];
$countryWhereClause = $user->country ? "WHERE country = '{$user->country}'" : 'WHERE country IS NULL';
$regionWhereClause = $user->region ? "AND region = '{$user->region}'" : 'AND region IS NULL';
$totalGlobalRank = DB::select("SELECT t1.user_id, t1.rank, t1.total_score FROM (SELECT p.user_id, p.total_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, SUM(score) AS total_score FROM game_instances GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.total_score DESC) t1 WHERE t1.user_id = {$user->id}");
$totalCountryRank = DB::select("SELECT t1.user_id, t1.rank, t1.total_score FROM (SELECT p.user_id, p.total_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, SUM(score) AS total_score FROM game_instances {$countryWhereClause} GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.total_score DESC) t1 WHERE t1.user_id = {$user->id}");
$totalRegionRank = DB::select("SELECT t1.user_id, t1.rank, t1.total_score FROM (SELECT p.user_id, p.total_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, SUM(score) AS total_score FROM game_instances {$countryWhereClause} {$regionWhereClause} GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.total_score DESC) t1 WHERE t1.user_id = {$user->id}");
$highGlobalRank = DB::select("SELECT t1.user_id, t1.rank, t1.max_score FROM (SELECT p.user_id, p.max_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, MAX(score) AS max_score FROM game_instances GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.max_score DESC) t1 WHERE t1.user_id = {$user->id}");
$highCountryRank = DB::select("SELECT t1.user_id, t1.rank, t1.max_score FROM (SELECT p.user_id, p.max_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, MAX(score) AS max_score FROM game_instances {$countryWhereClause} GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.max_score DESC) t1 WHERE t1.user_id = {$user->id}");
$highRegionRank = DB::select("SELECT t1.user_id, t1.rank, t1.max_score FROM (SELECT p.user_id, p.max_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, MAX(score) AS max_score FROM game_instances {$countryWhereClause} {$regionWhereClause} GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.max_score DESC) t1 WHERE t1.user_id = {$user->id}");
if (count($totalGlobalRank)) {
$data['total']['player']['score'] = $totalGlobalRank[0]->total_score;
$data['total']['player']['global_rank'] = $totalGlobalRank[0]->rank;
}
if (count($totalCountryRank)) {
$data['total']['player']['country_rank'] = $totalCountryRank[0]->rank;
}
if (count($totalRegionRank)) {
$data['total']['player']['region_rank'] = $totalRegionRank[0]->rank;
}
if (count($highGlobalRank)) {
$data['high']['player']['score'] = $highGlobalRank[0]->max_score;
$data['high']['player']['global_rank'] = $highGlobalRank[0]->rank;
}
if (count($highCountryRank)) {
$data['high']['player']['country_rank'] = $highCountryRank[0]->rank;
}
if (count($highRegionRank)) {
$data['high']['player']['region_rank'] = $highRegionRank[0]->rank;
}
$countryWhereClause = $user->country ? "WHERE g.country = '{$user->country}'" : 'WHERE g.country IS NULL';
$regionWhereClause = $user->region ? "AND g.region = '{$user->region}'" : 'AND g.region IS NULL';
$totalGlobalLeaderboards = $this->totalGlobalLeaderboards($user);
$totalCountryLeaderboards = $this->totalCountryLeaderboards($user);
$totalRegionLeaderboards = $this->totalRegionLeaderboards($user);
$highGlobalLeaderboards = $this->highGlobalLeaderboards($user);
$highCountryLeaderboards = $this->highCountryLeaderboards($user);
$highRegionLeaderboards = $this->highRegionLeaderboards($user);
foreach ($totalGlobalLeaderboards as $r) {
$data['total']['global'][] = ['name' => $r->name, 'score' => $r->total_score, 'rank' => $r->rank, 'is_user' => $user->id == $r->user_id];
}
foreach ($totalCountryLeaderboards as $r) {
$data['total']['country'][] = ['name' => $r->name, 'score' => (int) $r->total_score, 'rank' => $r->rank, 'is_user' => $user->id == $r->user_id];
}
foreach ($totalRegionLeaderboards as $r) {
$data['total']['region'][] = ['name' => $r->name, 'score' => (int) $r->total_score, 'rank' => $r->rank, 'is_user' => $user->id == $r->user_id];
}
foreach ($highGlobalLeaderboards as $r) {
$data['high']['global'][] = ['name' => $r->name, 'score' => (int) $r->max_score, 'rank' => $r->rank, 'is_user' => $user->id == $r->user_id];
}
foreach ($highCountryLeaderboards as $r) {
$data['high']['country'][] = ['name' => $r->name, 'score' => (int) $r->max_score, 'rank' => $r->rank, 'is_user' => $user->id == $r->user_id];
}
foreach ($highRegionLeaderboards as $r) {
$data['high']['region'][] = ['name' => $r->name, 'score' => (int) $r->max_score, 'rank' => $r->rank, 'is_user' => $user->id == $r->user_id];
}
return apiSend($data);
}
// Returns leaderboards with ranks near user rank, if user is not in the top 10.
public function userLeaderboards(Request $request)
{
$user = $request->input('_user');
if (!$user) {
return apiSend(null, 401);
}
$rank = (int) $request->query('rank');
$type = $request->query('type');
$scope = $request->query('scope');
if ($rank <= 10) {
return apiSend(null, 400);
}
$data = [];
$rows = [];
switch (true) {
case $type == 'total' && $scope == 'global':
$rows = $this->totalGlobalLeaderboards($user, $rank);
break;
case $type == 'total' && $scope == 'country':
$rows = $this->totalCountryLeaderboards($user, $rank);
break;
case $type == 'total' && $scope == 'region':
$rows = $this->totalRegionLeaderboards($user, $rank);
break;
case $type == 'high' && $scope == 'global':
$rows = $this->highGlobalLeaderboards($user, $rank);
break;
case $type == 'high' && $scope == 'country':
$rows = $this->highCountryLeaderboards($user, $rank);
break;
case $type == 'high' && $scope == 'region':
$rows = $this->highRegionLeaderboards($user, $rank);
break;
default:
return apiSend(null, 400);
}
foreach ($rows as $r) {
$data[] = ['name' => $r->name, 'score' => (int) ($type == 'total' ? $r->total_score : $r->max_score), 'rank' => (int) $r->rank, 'is_user' => $user->id == $r->user_id];
}
return apiSend($data);
}
private function totalGlobalLeaderboards($user, $rank = 0)
{
if (!$user) {
return [];
}
$offset = $rank > 10 ? sprintf('OFFSET %d', $rank - 6) : '';
$rowNumInit = $rank > 10 ? $rank - 6 : 0;
return DB::select("SELECT t.*, @rownum := @rownum + 1 AS rank FROM (SELECT u.name, g.user_id, SUM(g.score) AS total_score FROM game_instances g INNER JOIN users u ON u.id = g.user_id GROUP BY user_id ORDER BY total_score DESC LIMIT 10 {$offset}) t, (SELECT @rownum := {$rowNumInit}) r");
}
private function totalCountryLeaderboards($user, $rank = 0)
{
if (!$user) {
return [];
}
$offset = $rank > 10 ? sprintf('OFFSET %d', $rank - 6) : '';
$rowNumInit = $rank > 10 ? $rank - 6 : 0;
$countryWhereClause = $user->country ? "WHERE g.country = '{$user->country}'" : 'WHERE g.country IS NULL';
return DB::select("SELECT t.*, @rownum := @rownum + 1 AS rank FROM (SELECT u.name, g.user_id, SUM(g.score) AS total_score FROM game_instances g INNER JOIN users u ON u.id = g.user_id {$countryWhereClause} GROUP BY user_id ORDER BY total_score DESC LIMIT 10 {$offset}) t, (SELECT @rownum := {$rowNumInit}) r");
}
private function totalRegionLeaderboards($user, $rank = 0)
{
if (!$user) {
return [];
}
$offset = $rank > 10 ? sprintf('OFFSET %d', $rank - 6) : '';
$rowNumInit = $rank > 10 ? $rank - 6 : 0;
$countryWhereClause = $user->country ? "WHERE g.country = '{$user->country}'" : 'WHERE g.country IS NULL';
$regionWhereClause = $user->region ? "AND g.region = '{$user->region}'" : 'AND g.region IS NULL';
return DB::select("SELECT t.*, @rownum := @rownum + 1 AS rank FROM (SELECT u.name, g.user_id, SUM(g.score) AS total_score FROM game_instances g INNER JOIN users u ON u.id = g.user_id {$countryWhereClause} {$regionWhereClause} GROUP BY user_id ORDER BY total_score DESC LIMIT 10 {$offset}) t, (SELECT @rownum := {$rowNumInit}) r");
}
private function highGlobalLeaderboards($user, $rank = 0)
{
if (!$user) {
return [];
}
$offset = $rank > 10 ? sprintf('OFFSET %d', $rank - 6) : '';
$rowNumInit = $rank > 10 ? $rank - 6 : 0;
return DB::select("SELECT t.*, @rownum := @rownum + 1 AS rank FROM (SELECT u.name, g.user_id, MAX(g.score) AS max_score FROM game_instances g INNER JOIN users u ON u.id = g.user_id GROUP BY user_id ORDER BY max_score DESC LIMIT 10 {$offset}) t, (SELECT @rownum := {$rowNumInit}) r");
}
private function highCountryLeaderboards($user, $rank = 0)
{
if (!$user) {
return [];
}
$offset = $rank > 10 ? sprintf('OFFSET %d', $rank - 6) : '';
$rowNumInit = $rank > 10 ? $rank - 6 : 0;
$countryWhereClause = $user->country ? "WHERE g.country = '{$user->country}'" : 'WHERE g.country IS NULL';
return DB::select("SELECT t.*, @rownum := @rownum + 1 AS rank FROM (SELECT u.name, g.user_id, MAX(g.score) AS max_score FROM game_instances g INNER JOIN users u ON u.id = g.user_id {$countryWhereClause} GROUP BY user_id ORDER BY max_score DESC LIMIT 10 {$offset}) t, (SELECT @rownum := {$rowNumInit}) r");
}
private function highRegionLeaderboards($user, $rank = 0)
{
if (!$user) {
return [];
}
$offset = $rank > 10 ? sprintf('OFFSET %d', $rank - 6) : '';
$rowNumInit = $rank > 10 ? $rank - 6 : 0;
$countryWhereClause = $user->country ? "WHERE g.country = '{$user->country}'" : 'WHERE g.country IS NULL';
$regionWhereClause = $user->region ? "AND g.region = '{$user->region}'" : 'AND g.region IS NULL';
return DB::select("SELECT t.*, @rownum := @rownum + 1 AS rank FROM (SELECT u.name, g.user_id, MAX(g.score) AS max_score FROM game_instances g INNER JOIN users u ON u.id = g.user_id {$countryWhereClause} {$regionWhereClause} GROUP BY user_id ORDER BY max_score DESC LIMIT 10 {$offset}) t, (SELECT @rownum := {$rowNumInit}) r");
}
如您所见，我的 SQL 并不流利。
谢谢。
编辑 2：我不知道是否可以将排行榜查询组合在一起，因为它们每个都返回自己的结果集而不是单行，但如果你认为它们可以结合起来，我会很高兴也很感激知道这一点——也许会返回一个多维数组。
有 6 个排行榜：(total_score, max_score) x (global, country, region)。
每个排行榜最多包含 10 条具有这种结构的记录：
[
{
"name": "Mina", // Joined from users table.
"user_id": 1,
"toal_score": 7400, // Or max_score for Max Score Leaderboards.
"rank": 1,
},
{...}
]
但我认为可以将所有（特定用户的）排名查询组合成一个查询，因为它们只返回一行，我们可以将多个列连接在一起。像这样的：
// SELECT ... WHERE user_id = 1;
{
"total_score_global": 3540,
"total_score_global_rank": 13,
"total_score_country": 2830,
"total_score_country_rank": 6,
"total_score_region": 2600,
"total_score_region_rank": 2,
"max_score_global": 1084,
"max_score_global_rank": 19,
"max_score_country": 0, // No data for this user with given country.
"max_score_country_rank": 0, // So his rank will be 0.
"max_score_region": 950,
"max_score_region_rank": 1,
}
我只想优化这些查询的执行，可能通过减少查询计数——目前为 12。
我确实尝试过实现这一点，但我得到的只是空的结果集或语法错误。
我的许多尝试之一是这样的：
SELECT
r1.total_score AS total_score_global, r1.rank AS total_score_global_rank,
r2.total_score AS total_score_country, r2.rank AS total_score_country_rank,
r3.total_score AS total_score_region, r3.rank AS total_score_region_rank,
r4.max_score AS max_score_global, r4.rank AS max_score_global_rank,
r5.max_score AS max_score_country, r5.rank AS max_score_country_rank,
r6.max_score AS max_score_region, r6.rank AS max_score_region_rank,
FROM
(SELECT t1.user_id, t1.rank, t1.total_score FROM (SELECT p.user_id, p.total_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, SUM(score) AS total_score FROM game_instances GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.total_score DESC) t1 WHERE t1.user_id = 1) r1,
(SELECT t1.user_id, t1.rank, t1.total_score FROM (SELECT p.user_id, p.total_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, SUM(score) AS total_score FROM game_instances WHERE country = 'cname' GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.total_score DESC) t1 WHERE t1.user_id = 1) r2,
(SELECT t1.user_id, t1.rank, t1.total_score FROM (SELECT p.user_id, p.total_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, SUM(score) AS total_score FROM game_instances WHERE country = 'cname' AND region = 'rname' GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.total_score DESC) t1 WHERE t1.user_id = 1) r3,
(SELECT t1.user_id, t1.rank, t1.max_score FROM (SELECT p.user_id, p.max_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, MAX(score) AS max_score FROM game_instances GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.max_score DESC) t1 WHERE t1.user_id = 1) r4,
(SELECT t1.user_id, t1.rank, t1.max_score FROM (SELECT p.user_id, p.max_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, MAX(score) AS max_score FROM game_instances WHERE country = 'cname' GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.max_score DESC) t1 WHERE t1.user_id = 1) r5,
(SELECT t1.user_id, t1.rank, t1.max_score FROM (SELECT p.user_id, p.max_score, @curRank := @curRank + 1 AS rank FROM (SELECT user_id, MAX(score) AS max_score FROM game_instances WHERE country = 'cname' AND region = 'rname' GROUP BY user_id) p, (SELECT @curRank := 0) r ORDER BY p.max_score DESC) t1 WHERE t1.user_id = 1) r6
【问题讨论】：
-
你用的是哪个 MySQL ？
-
@BerndBuffen MySQL 5.7 版。
-
编辑您的问题并显示您想要的结果，
-
@GordonLinoff 我在问题的底部做了这个（编辑 2）。
-
@ma3x - 如果您发布表的创建以及一些示例日期和预期结果，我将给您写一个查询。你可以把它放在sqlfiddle.com
标签： php mysql sql laravel rank