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SQL Query: 3 Methods for Calculating Cumulative SUM

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SQL provides various constructs for calculating cumulative sums, offering flexibility and efficiency in data analysis. In this article, we explore three distinct SQL queries that facilitate the computation of cumulative sums. Each query leverages different SQL constructs to achieve the desired outcome, catering to diverse analytical needs and preferences. Using Window Functions (e.g., PostgreSQL, SQL Server, Oracle) SELECT id, value, SUM(value) OVER (ORDER BY id) AS cumulative_sum  FROM your_table; This query uses the SUM() window function with the OVER clause to calculate the cumulative sum of the value column ordered by the id column. Using Subqueries (e.g., MySQL, SQLite): SELECT t1.id, t1.value, SUM(t2.value) AS cumulative_sum FROM your_table t1 JOIN your_table t2 ON t1.id >= t2.id GROUP BY t1.id, t1.value ORDER BY t1.id; This query uses a self-join to calculate the cumulative sum. It joins the table with itself, matching rows where the id in the first table is greater than or

Aws course contents ideas to learn

What you are going to learn in AWS course is matter. So before you take the course just look at the course contents on aws. 


aws concepts
AWS Course Contents for beginners

What you will get after taking Aws course
  • Recognize terminology and concepts as they relate to the AWS platform
  • Navigate the AWS Management Console
  • Understand the security measures AWS provides
  • Differentiate AWS Storage options and create an Amazon Simple Storage Service (S3) bucket
  • Recognize AWS Compute and Networking options and use Amazon Elastic Compute Cloud (EC2) and Amazon Elastic Block Storage (EBS)
  • Describe Managed Services and Database options
  • Use Amazon Relational Database Service (RDS) to launch an application
  • Identify Deployment and Management options
Intended Audience
  • Individuals responsible for articulating the business benefits of AWS services
  • Any individual who is new to AWS
  • SysOps Administrators and Developers who are interested in using AWS services
This course includes activities that will allow you to test new skills and apply knowledge through hands-on lab activities.

Aws Course Outline

Module 1: Introduction; History to AWS

  • Navigate the AWS Management Console
  • Recognize AWS Global Infrastructure
  • Describe the security measures AWS provides

Module 2: AWS Storage & Content Delivery

  • Identify key AWS storage options
  • Describe Amazon EBS
  • Create an Amazon S3 bucket and manage associated objects

Module 3: Compute Services & Networking

  • Identify the different AWS compute and networking options
  • Describe an Amazon Virtual Private Cloud (VPC)
  • Create an Amazon EC2 instance
  • Verify how to use Amazon EBS

Module 4: AWS Managed Services & Database

  • Describe Amazon DynamoDB
  • Verify key aspects of Amazon RDS
  • Execute an Amazon RDS drive application

Module 5: Deployment and Management

  • Identify AWS CloudFormation
  • Describe Amazon CloudWatch metrics and alarms
  • Describe Amazon Identity and Access Management (IAM)

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