Data Science & Analytics

Structuring Queries with Common Table Expressions

Learn to replace nested subqueries with named CTEs, compose multi-step query pipelines, stage order and customer revenue aggregations, and generate a recursive month spine. By the end, you can make complex online-shop analysis clearer and easier to extend.

SQL

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4 lessons

12 practices

2 hours

Course details

Structuring Queries with CTEs

Preview

Structure Order Totals Query

Extend the Order Report

Organize the Order Report

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Francisco Aguilar Meléndez

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From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

Structuring Queries with Common Table Expressions

Course details

Unit 13 practices26 min

Unit 23 practices26 min

Unit 33 practices26 min

Unit 43 practices26 min

Turn screen time into skills time

Join the 1M+ learners on CodeSignal

From our community

From our community