SQL · Data Analytics & Engineering

CTEs in SQL From messy queries to clean steps

Nested subqueries read inside-out. CTEs let you name each step and read top to bottom: easier to write, debug and explain in an interview.

Nested subqueries read inside-out. CTEs let you name each step and read top to bottom, so a query is easier to write, debug and explain in an interview. In this live SQL masterclass we cover six things: when SQL gets complicated and why nested subqueries are hard to read; the CTE mental model, named and scoped steps inside one query; multiple CTEs that break a business report into steps; recursive CTEs for org charts and hierarchies, level by level; what really happens, with execution plans and performance myths; and choosing the right tool, CTE against subquery against temp table against view. Bring your questions: live Q&A at the end. Outside India that is Sunday 25 October at 12:00 AM PT, 2:00 AM CT, 3:00 AM ET, 7:00 AM GMT, 8:00 AM CET, 11:00 AM GST, 3:00 PM SGT and 6:00 PM AEDT.