This article shows you how to use SQL to process weekly report data

【 subject 】

There are three tables in the database of a company , Weekly sales table 、 Store information table 、 Daily sales schedule .

Table 1 ： The weekly sales table records the sales information of stores across the country in each natural week , The field contains weeks 、 Store code 、 Tag amount 、 Sales amount .

Table two ： The store information table records the area where the store is located , The hierarchical relationship and business type corresponding to the store , The field contains the store code 、 Area 、 The abbreviation of superior customer 、 Business types .

Table 3 ： The daily sales schedule records the amount of goods sold by stores in different regions of the country every day , Customer nature and product information , Field contains area 、 The abbreviation of superior customer 、 Superior customer code 、 Customer nature 、 Store code 、 Sales date 、 Sales amount 、 Commodity code .

Business needs ：

1. For different areas 、 Tag amount of business type 、 Summarize the sales amount （ Time range 202201-202205 Zhou .

2. The extraction area is East China 、 Central China 、 West China District 、 In South China , And the customer is self-supporting ,2022 year 3 Monthly and daily sales data for the same period .

【 Their thinking 】

1. For different areas 、 Tag amount of business type 、 Summarize the sales amount （ Time range 202201-202205 Zhou ）

Let's first translate this business requirement into Chinese ：

1） The fields required for query results are areas 、 Business types 、 Tag amount 、 Sales amount

2） The screening time week is 202201-202205

3） For different areas 、 Tag amount of business type 、 Summarize the sales amount

1） The fields required for query results are areas 、 Business types 、 Tag amount 、 Sales amount

Tag amount 、 The sales amount is in the weekly sales table , Area 、 The business type is in the store information table , Fields involving two tables , So you need to join multiple tables .

Look at the two tables , We know that the name of the two tables is the same and the associated field is store code , Join two tables with store code .

What kind of connection to use ？ take out 《 monkey Learn from scratch SQL》 The multi table connection diagram inside .

Because you need to get the business type corresponding to each store code , So use the left link to keep all the sales data in the weekly sales table .

SQL Write the following ：

select  *
from  Weekly sales table  a
left join  Store information table  b
on a. Store code  = b. Store code ;

2） The screening time week is 202201-202205, Use between Function to filter the time range .

SQL Write the following ：

select  *
from  Weekly sales table  a
left join  Store information table  b  
on a. Store code  = b. Store code 
where  Zhou  between 202201 and 202205;

Query results ：

3） For different areas 、 Tag amount of business type 、 Summarize the sales amount

The business demand only displays the tag amount and sales amount , We use group summary to summarize different areas 、 Business class grouping （group by）, For the tag amount 、 Sum the sales amount （ Sum function sum）

SQL Write the following ：

select  Area ,
             Business types ,
            sum(a. Tag amount ) AS " Total tag amount ",
            sum(a. Sales amount ) AS " Total sales amount "
from  Weekly sales table  a
left join  Store information table  b
on a. Store code  = b. Store code 
where  Zhou  between 202201 and 202205
group by  Business types , Area ;

Query results ：

2、 The extraction area is East China 、 Central China 、 West China District 、 In South China , And the customer is self-supporting ,2022 year 3 Monthly and daily sales data for the same period .

Demand display field area 、 Customer nature 、 Sales date , Daily sales details include , Now we only need to classify the customer as “ Self-support ” And the time is 2022 year 3 The month and 2021 year 3 month （ At the same time ） Data display .

SQL Use in date_format Set the format of the sales date in the daily sales table to the format of month and year .

SQL Write the following ：

select   *
from  Daily sales schedule 
where   Area  in (
              " East China ",
              " Central China ",
              " West China District ",
              " South China " )
and  Customer nature  = " Self-support "
and date_format( Sales date , '%Y-%m') between "2021-03" and "2022-03";

Query results ：

【 The test point of this question 】

1. Business requirements are broken down into problems , Try to translate into Chinese , Find out the connection and breakthrough points according to the needs .

2.SQL How to use the most common connections in , Learn reference monkey Free Tutorial 《 The illustration SQL Interview questions 》.

3. If the date format in the data table is not the presentation result we want , Learn to date_format Function to convert .

 ️ Click on 「 Read the original 」

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