FineBI practical project one (8): Number of orders per hour per day

1. Clarify the goals of data analysis

Count the number of orders generated every hour

2 Create a table to save data analysis results

create table app_hour_orders(
  id int primary key auto_increment,
  daystr varchar(20),
  hourstr varchar(20),
  cnt int
);

3. Write SQL statements for data analysis

select
	substring(createTime,1,10) as daystr,
	substring(createTime,12,2) as hourstr,
	count(*) as cnt
from ods_finebi_orders
group by
	substring(createTime,1,10),substring(createTime,12,2)
order by hourstr;

4 Load data into the results table

insert into app_hour_orders
select
	null,
	substring(createTime,1,10) as daystr,
	substring(createTime,12,2) as hourstr,
	count(*) as cnt
from ods_finebi_orders
group by
	substring(createTime,1,10),substring(createTime,12,2)
order by hourstr;