To calculate the cumulative sum or running table, first, we will create a table that contains a count column and a day column. Next, we will create the Common Table Expressions and use the “Windows” function for calculating the Running total or Cumulative sum. This blog will discuss creating CTE(Common Table Expressions) and using the “Windows” function.
First, we create the table with the day column and the count column:
select to_date(start_date) as day, count(2) from sessions1 group by to_date(start_date);
After that, we will write the Snowflake CTE(Common Table Expressions) and utilise the window function for keeping the track of the running total or cumulative sum.
select to_date(start_date) as day, count(2) from sessions2 group by to_date(start_date); with data as ( select to_date(start_date) as day, count(2) as number_of_sessions from sessions2 group by to_date(start_date) ) select day, sum(number_of_sessions) over (order by day asc rows between unbounded preceding and current row) from data;
By the end of this blog, you can create the Common Table Expressions and use the Windows function for calculating the Running total or Cumulative sum. I hope this information is sufficient.
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Kalla Saikumar is a technology expert and is currently working as a content associate at MindMajix. Write articles on multiple platforms such as ServiceNow, Business Analysis, Performance Testing, Mulesoft, Oracle Exadata, Azure, and other courses. And you can join him on LinkedIn.
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