# How to Calculate Average Sales Per Week in MySQL

Average Sales Per Week is a useful metric for every business, no matter which industry you work in. It gives a good idea of how your business doing, and over a reasonable time frame. It also helps smoothen out the noise present day-to-day sales numbers. Here’s how to calculate average sales per week in MySQL.

## How to Calculate Average Sales Per Week in MySQL

There are multiple ways to calculate average sales per week in MySQL. We will look at each of them

Let’s say you have table with daily sales data sales(order_date,sale)

```mysql>create table sales(order_date date,sale int);

mysql>insert into sales(order_date,sale)
values('2020-01-01',10),('2020-01-02',12),('2020-01-03',15),
('2020-01-04',11),('2020-01-05',13),('2020-01-06',9),
('2020-01-07',21),('2020-01-08',10),('2020-01-09',10),
('2020-01-10',2),('2020-01-11',16),('2020-01-12',12),
('2020-01-13',10),('2020-01-14',18),('2020-01-15',15),
('2020-01-16',12),('2020-01-17',10),('2020-01-18',18),
('2020-01-19',14),('2020-01-20',16),('2020-01-21',12),
('2020-01-22',21),('2020-01-23',13),('2020-01-24',15),
('2020-01-25',20),('2020-01-26',14),('2020-01-27',16),
('2020-01-28',15),('2020-01-29',10),('2020-01-30',18);

mysql>select * from sales;
+------------+------+
| order_date | sale |
+------------+------+
| 2020-01-01 |   10 |
| 2020-01-02 |   12 |
| 2020-01-03 |   15 |
| 2020-01-04 |   11 |
| 2020-01-05 |   13 |
| 2020-01-06 |    9 |
| 2020-01-07 |   21 |
| 2020-01-08 |   10 |
| 2020-01-09 |   10 |
| ...        |   ...|
+------------+------+

```

## Calculate Average Sales Per Week in MySQL

MySQL provides a built-in function WEEK to that return the WEEK number of the year. You can easily calculate average sales per week in MySQL using GROUP BY clause and AVG function, as shown below.

```mysql> select week(order_date),avg(sale) from sales
-> group by week(order_date);
+------------------+-----------+
| week(order_date) | avg(sale) |
+------------------+-----------+
|                0 |   12.0000 |
|                1 |   11.5714 |
|                2 |   13.5714 |
|                3 |   15.8571 |
|                4 |   14.6000 |
+------------------+-----------+
```

You can beautify your result by using CONCAT and ROUND functions – CONCAT can be used to concatenate custom strings to week numbers, and ROUND function can be used to round average values. Here’s an example,

```mysql> select concat('Week ',week(order_date)) as 'Week',round(avg(sale),2) as 'Average Sale'
from sales group by week(order_date);
+--------+--------------+
| Week   | Average Sale |
+--------+--------------+
| Week 0 |        12.00 |
| Week 1 |        11.57 |
| Week 2 |        13.57 |
| Week 3 |        15.86 |
| Week 4 |        14.60 |
+--------+--------------+
```

If your table has more columns, whose averages you want to calculate, you can simply add them to your query as shown below in bold

```mysql> select concat('Week ',week(order_date)) as 'Week',round(avg(sale),2) as 'Average Sale'
,round(avg(goal),2) as 'Average Goals',round(avg(revenue),2) as 'Average Revenue'
from sales group by week(order_date);
```

```mysql> select week(order_date),avg(sale) from sales WHERE <condition here>
-> group by week(order_date);
```

Bonus Read : How to Calculate Total Sales Per Month in MySQL?

MySQL’s Week function provides multiple ways to calculate weekly data.  Its syntax is

WEEK(datefirstdayofweek)

firstdayofweek is optional, and can take the following values

Option value First day of week Range Week 1 is the first week …
0 Sunday 0-53 with a Sunday in this year
1 Monday 0-53 with more than 3 days this year
2 Sunday 1-53 with a Sunday in this year
3 Monday 1-53 with more than 3 days this year
4 Sunday 0-53 with more than 3 days this year
5 Monday 0-53 with a Monday in this year
6 Sunday 1-53 with more than 3 days this year
7 Monday 1-53 with a Monday in this year

Default value is 0.

When you calculate average sales per week in MySQL, be careful while using the second argument in WEEK function. If not used properly, you might end up miscalculating average numbers.

Finally, you can use a reporting tool to plot average sales per week on a dashboard and share it with your team. Here’s an example of bar chart showing average sales per week, created using Ubiq.

If you want to create sales charts, dashboards & reports from MySQL database, you can try Ubiq. We offer a 14-day free trial.