游戏玩家的留存率统计实现

玩家在某段时间内注册开始游戏，经过一段时间后，仍然继续游戏的被认作是留存；这部分用户占当时新增用户的比例即是留存率，会按照每隔1单位时间（例日、周、月）来进行统计。顾名思义，留存指的就是“有多少玩家留下来了”。留存用户和留存率体现了应用的质量和保留用户的能力。

留存率 在不同的游戏中 算法不一样

留存率说明
某时间内的新增用户，经过一段时间后，仍继续登录游戏的被认作时留存用户；这部分用户占当时新增用户的比例即是留存率。
例如：
9月5日新增用户200，这200人在6日登录游戏的有100人,7日登录有80人，8日登录有50人；
则9月5日次日留存率是50%，3日留存率是40%，4日留存率是25%。
这是我们游戏里的计算方式

 这样统计 有科学根据的
比如 哪天 你开广@告了 就可以看 他带来的用户质量
还有 这样的留存 数据 也会好看的

-- 登录日志
DROP TABLE IF EXISTS log_login;
CREATE TABLE log_login(
  id INT (11) UNSIGNED NOT NULL AUTO_INCREMENT,
  player_id INT(11) UNSIGNED NOT NULL,
  last_login_time timestamp NOT NULL DEFAULT '2000-01-01 00:00:00',
  register_time timestamp NOT NULL DEFAULT '2000-01-01 00:00:00', 
  PRIMARY KEY (id)
)ENGINE=MYISAM DEFAULT CHARSET=utf8;

log_login的数据在每个玩家登陆的时候产生一条，为了接下去的存储过程执行效率的考虑，冗余了每个玩家的注册时间。

-- 统计留存率
DROP TABLE IF EXISTS stat_remain;
CREATE TABLE stat_remain(
  id INT (11) UNSIGNED NOT NULL AUTO_INCREMENT,
  dru INT(11) NOT NULL, -- 每日新注册用户
  second_day INT(11) DEFAULT NULL,
  third_day INT(11) DEFAULT NULL,
  seventh_day INT(11) DEFAULT NULL,
  thirtieth_day INT(11) DEFAULT NULL,  
  stat_time timestamp NOT NULL DEFAULT '2000-01-01 00:00:00',
  add_time timestamp NOT NULL DEFAULT '2000-01-01 00:00:00', 
  PRIMARY KEY (id)
)ENGINE=MYISAM DEFAULT CHARSET=utf8;

DELIMITER $$
-- 统计留存率
DROP PROCEDURE IF EXISTS stat_remain_player$$
CREATE PROCEDURE stat_remain_player()
BEGIN
-- 今天的日期
declare today date default curdate();
declare yesterday date default date_sub(today, interval 1 day);
declare days_ago_2 date default date_sub(today, interval 2 day);
declare days_ago_3 date default date_sub(today, interval 3 day);
declare days_ago_4 date default date_sub(today, interval 4 day);


declare days_ago_6 date default date_sub(today, interval 6 day);
declare days_ago_7 date default date_sub(today, interval 7 day);


declare days_ago_13 date default date_sub(today, interval 13 day);
declare days_ago_14 date default date_sub(today, interval 14 day);


declare days_ago_29 date default date_sub(today, interval 29 day);
declare days_ago_30 date default date_sub(today, interval 30 day);


-- 统计昨天DRU(就是昨天一天的注册人数)
insert into stat_remain(dru, stat_time, add_time) select count(id) , yesterday, now() from user where role_num>0 and roll=false and last_login_time>'2000-01-01' and add_time between yesterday and today;


-- 修改前天的2日留存
update stat_remain set second_day = (
select(
   (select count(distinct player_id) from log_login where (register_time between days_ago_2 and yesterday) and (last_login_time between yesterday and today))
/ 
(select count(distinct player_id) from log_login where (register_time between days_ago_2 and yesterday))
)
) where stat_time = days_ago_2;


-- 修改大前天的3日留存
update stat_remain set third_day = (
select(
   (select count(distinct player_id) from log_login where (register_time between days_ago_3 and days_ago_2) and (last_login_time between yesterday and today))
/ 
(select count(distinct player_id) from log_login where (register_time between days_ago_3 and days_ago_2))
)
) where stat_time = days_ago_3;


-- 7日留存
update stat_remain set seventh_day = (
select(
   (select count(distinct player_id) from log_login where (register_time between days_ago_7 and days_ago_6) and (last_login_time between yesterday and today))
/ 
(select count(distinct player_id) from log_login where (register_time between days_ago_7 and days_ago_6))
)
) where stat_time = days_ago_7;


-- 14日留存
update stat_remain set fourteen_day = (
select(
   (select count(distinct player_id) from log_login where (register_time between days_ago_14 and days_ago_13) and (last_login_time between yesterday and today))
/ 
(select count(distinct player_id) from log_login where (register_time between days_ago_14 and days_ago_13))
)
) where stat_time = days_ago_14;


-- 30日留存
update stat_remain set thirtieth_day = (
select(
   (select count(distinct player_id) from log_login where (register_time between days_ago_30 and days_ago_29) and (last_login_time between yesterday and today))
/ 
(select count(distinct player_id) from log_login where (register_time between days_ago_30 and days_ago_29))
)
) where stat_time = days_ago_30;
END
$$


DELIMITER ;

stat_remain_player 存储过程在每新的一天的0点0分1秒左右去执行，生成stat_remain数据，并对离当天stat_time差距为1天，2天，6天和29天的记录进行更新。