閒著沒事搞了一下，歡迎指教。。
使用者表：
create table `usr` (
`uid` int(11) not null,
`name` char(10) default null,
primary key (`uid`)
) engine=innodb default charset=utf8;
吃飯記錄表：
create table `meal` (
`mid` int(11) not null,
`money` int(11) default null comment '付款金額',
`pay_uid` int(11) default null comment '付款人員id',
`dt` date default null,
primary key (`mid`)
) engine=innodb default charset=utf8;
吃飯人員流水表：
create table `meal_jnl` (
`id` int(11) not null auto_increment,
`mid` int(11) default null,
`in_uid` int(11) default null comment '參加人員id',
primary key (`id`)
) engine=innodb auto_increment=52 default charset=utf8;
造資料：
insert into `usr` (`uid`, `name`)
values
(1, 'jim'),
(2, 'jeak'),
(3, 'lucy'),
(4, 'carl'),
(5, 'jerry'),
(6, 'mark');
insert into `meal` (`mid`, `money`, `pay_uid`, `dt`)
values
(1, 122, 2, '2017-06-01'),
(2, 56, 4, '2017-06-01'),
(3, 56, 1, '2017-06-02'),
(4, 76, 3, '2017-06-03'),
(5, 54, 5, '2017-06-04'),
(6, 66, 2, '2017-06-05'),
(7, 77, 2, '2017-06-05'),
(8, 34, 3, '2017-06-06'),
(9, 54, 1, '2017-06-07'),
(10, 77, 4, '2017-06-08'),
(11, 45, 5, '2017-06-08'),
(12, 87, 2, '2017-06-10'),
(13, 123, 3, '2017-06-11'),
(14, 431, 1, '2017-06-11'),
(15, 23, 4, '2017-06-12');
insert into `meal_jnl` (`id`, `mid`, `in_uid`)
values
(1, 1, 2),
(2, 1, 3),
(3, 1, 4),
(4, 1, 5),
(5, 2, 1),
(6, 2, 2),
(7, 2, 4),
(8, 2, 5),
(9, 3, 1),
(10, 3, 2),
(11, 3, 3),
(12, 3, 4),
(13, 3, 5),
(14, 4, 3),
(15, 4, 4),
(16, 4, 5),
(17, 5, 2),
(18, 5, 5),
(19, 6, 4),
(20, 6, 5),
(21, 6, 1),
(22, 6, 2),
(23, 7, 2),
(24, 7, 5),
(25, 7, 1),
(26, 8, 2),
(27, 8, 3),
(28, 8, 4),
(29, 8, 5),
(30, 9, 1),
(31, 9, 4),
(32, 10, 1),
(33, 10, 2),
(34, 10, 3),
(35, 10, 4),
(36, 10, 5),
(37, 11, 1),
(38, 11, 2),
(39, 11, 5),
(40, 12, 2),
(41, 12, 5),
(42, 13, 3),
(43, 13, 1),
(44, 14, 1),
(45, 14, 3),
(46, 14, 4),
(47, 15, 3),
(48, 15, 4),
(49, 15, 5),
(50, 15, 6),
(51, 11, 6);
獲取沒人月底應付金額：
select in_uid,out_mon-pay_mon tm,name from (
select sum(case when money is null then 0 else money end) pay_mon,uid,name
from meal right join usr
on meal.`pay_uid`=usr.uid
where dt between '' and ''
group by pay_uid) aaa
right join (
select in_uid,sum(am) out_mon
from (
select a.mid,money/count(in_uid) am
from meal_jnl a join meal b
on a.mid=b.mid
where b.dt between '' and ''
group by mid) aa
join meal_jnl bb
on aa.mid=bb.mid group by in_uid) bbb
on aaa.uid=bbb.in_uid;
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