Documentation Visual SQL (beta) FAQs

Group & Aggregate example

A common metric that lots of companies are interested in knowing is the monthly average of the count of users created per day. You can calculate this using a nested SELECT statement in SQL Mode or do it in Interactive Mode in just a few steps.

For this example, we use our demo data source named Document Company Demo Data.

  1. First, add the Id and Created Date columns from the Users table in the Digisign2 schema. In the Results Table, make sure Created Date is grouped by Day and Id is aggregated using Count of Distinct.

    Your chart might look something like the chart below:

    Note: If you don’t need to use the full date column in your chart before calculating the average, you can instead group your Created Date column by the Month time bucket here and skip to step 6.

    Create your inital query calculating unique customers by day

  2. Next, we want to create a column showing only the month and year of Created Date so we can use it to group by later.

    To do this, add a Formula Column, choose the Custom formula type, then use the SQLite strftime() function function below for the formula, which extracts only the month and year from the “Created Date” column. We’ll use this column to group the average number of new users per month.

     strftime('%Y-%m',"Created Date")
    

    For clarity, rename this new column to Month of Created Date.

    Add a Formula Column to extract only the month and year of Created Date

  3. Now use Hide Column to hide the “Created Date” column since it’s no longer needed.
  4. Then, use a Reorder Columns Action to move the “Month of Created Date” column so it’s the first column in your Result Table.

    Hide Created Date and move Month of Created Date to the start of the Result Table

  5. And now for the most important part: Add a Group & Aggregate Action. We want to choose GROUP as the aggregation for “Month of Created Date” because we’ll use this column to group the “Count of distinct Users Id” by month. Since we want the average count of users, we’ll then choose AVG as the aggregation for the “Count of distinct Users Id” column. Click Save.

    Add a Group & Aggregate Action to get average of users by month

This process negates the need to write a nested SELECT statement and can be done in just a few minutes. A full preview of all the steps needed to create this chart can be found below:

View all Pipeline Actions