MySQL implements multi-table association statistics (subquery statistics) example

This article uses an example to describe how to implement multi-table association statistics in MySQL. Share with you for your reference, the details are as follows:

need:

Statistics on the reward amount for each book, recharge data statistics at different times, consumption statistics,

Design four tables, book table, orders table, reward_log table, consume_log table, and associate them with book table through book_id.

question:

When more than two tables are associated, data duplication occurs during statistics. You have to use a subquery to find it out. A subquery can only query one field. Here, the CONCAT_WS function is used to concatenate multiple fields.

accomplish:

The query code is as follows

SELECT
b.id,
b.book_name,
sum( IF ( o.create_time > 0 && o.create_time < 9999999999, o.price, 0 ) ) today_pay_money,
sum( IF ( o.create_time > 0 && o.create_time < 9999999999, 1, 0 ) ) today_pay_num,
sum( IF ( o.create_time > 999 && o.create_time < 9999, o.price, 0 ) ) yesterday_pay_money,
sum( IF ( o.create_time > 999 && o.create_time < 9999, 1, 0 ) ) yesterday_pay_num,
sum(o.price) total_pay_money,
sum( IF ( o.create_time > 9999 && o.create_time < 99999, 1, 0 ) ) total_pay_num,
( SELECT SUM( total_score ) FROM book_reward_log WHERE book_id = b.id ) total_score,
(
 SELECT
 CONCAT_WS(
  ',',
  SUM( IF ( create_time > 0 && create_time < 998, score, 0 ) ),
  SUM( IF ( create_time > 9999 && create_time < 99998, score, 0 ) ),
  SUM( IF ( create_time > 99999 && create_time < 999998, score, 0 ) )
 )
 FROM
 book_consume_log
 WHERE
 book_id = b.id
 ) score
 FROM
 book_book b
 LEFT JOIN book_orders o ON b.id = o.bid
GROUP BY
 b.id

Query results

score is three consumption numbers, separated by commas

Performance Analysis

Readers who are interested in more MySQL-related content can check out the following topics on this site: "MySQL query skills", "MySQL common functions summary", "MySQL log operation skills", "MySQL transaction operation skills summary", "MySQL stored procedure skills" and "MySQL database lock related skills summary"

I hope this article will be helpful to everyone's MySQL database design.