如何在mysql中确定该用户本周的滞纳金

Question

So here I have a case to determine this user he's late or not in his payments every week, to determine the late comparison to the date of payment and the previous overdue field

i have sample data like this

Name   to be paid    DATE PAID       OVERDUE DATE
Bakrie  195000       2019-07-01       2019-07-08
Rocky   195000       2019-07-01       2019-07-08
Bakrie  195000       2019-07-15       2019-07-22
Bakrie  195000       2019-07-29       2019-08-05
Bakrie  195000       2019-08-05       2019-08-12
Febri   130000       2019-06-25       2019-07-02

data that wish to be generated

 Name   to be paid    DATE PAID       OVERDUE DATE    sign
Bakrie  195000       2019-07-01       2019-07-08      NOT LATE
Rocky   195000       2019-07-01       2019-07-08      NOT LATE
Bakrie  195000       2019-07-15       2019-07-22      LATE
Bakrie  195000       2019-07-29       2019-08-05      Late
Bakrie  195000       2019-08-05       2019-08-12      not late
Febri   130000       2019-06-25       2019-07-02     not late

as you see user name bakrie he late payment because in second payment date paid is passing due date in previous record due date of his payment

I've tried querying like this but failed. He shows data not late like this

Bakrie  195000  2019-07-01  2019-07-08  NOT LATE
Bakrie  195000  2019-07-01  2019-07-08  NOT LATE
Bakrie  195000  2019-07-01  2019-07-08  NOT LATE
Bakrie  195000  2019-07-01  2019-07-08  NOT LATE
Rocky   195000  2019-07-01  2019-07-08  NOT LATE
Bakrie  195000  2019-07-15  2019-07-22  LATE

my query like this`

  select trackku.*, if(date paid > overdue_paid,'LATE','NOT LATE') from trackku

please help me!?!?!

Answer 1

I came to the following query based on your description of the problem.

select
  a.name, a.paid, a.date_paid, a.overdue_date,
  case
    when max(b.overdue_date) is null or
         max(b.overdue_date) >= a.date_paid then
      'not late'
    else
      'late'
  end as sign
from trackku as a
left join trackku as b
  on a.name = b.name and a.date_paid > b.date_paid
group by a.name, a.paid, a.date_paid, a.overdue_date;

Output:

+--------+--------+------------+--------------+----------+
|  name  |  paid  | date_paid  | overdue_date |   sign   |
+--------+--------+------------+--------------+----------+
| Bakrie | 195000 | 2019-07-01 | 2019-07-08   | not late |
| Bakrie | 195000 | 2019-07-15 | 2019-07-22   | late     |
| Bakrie | 195000 | 2019-07-29 | 2019-08-05   | late     |
| Bakrie | 195000 | 2019-08-05 | 2019-08-12   | not late |
| Febri  | 130000 | 2019-06-25 | 2019-07-02   | not late |
| Rocky  | 195000 | 2019-07-01 | 2019-07-08   | not late |
+--------+--------+------------+--------------+----------+

Test it online with SQL Fiddle .