Sql Cte — Free Sql Tutorial
Learn Sql Cte in Sql with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Sql Cte in Sql with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
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Sql Cte in Sql
A CTE (Common Table Expression) is a named temporary result set defined with the WITH clause. It makes complex queries readable by breaking them into named, reusable steps — like variables in SQL.
Without CTEs, complex queries use deeply nested subqueries that are hard to read and debug. CTEs let you define each logical step separately with a meaningful name, then reference it like a table.
Multiple CTEs: You can chain several CTEs separated by commas, where each can reference previous ones. This creates a readable step-by-step analytics pipeline.
Recursive CTEs reference themselves, enabling traversal of hierarchical data like org charts, category trees, and bill of materials.
Sql Cte — Syntax
WITH cte_name AS (
SELECT ... -- CTE definition
),
another_cte AS (
SELECT ... FROM cte_name -- can reference earlier CTEs
)
SELECT * FROM another_cte; -- main query
-- Recursive CTE:
WITH RECURSIVE hierarchy AS (
SELECT id, name, parent_id FROM org WHERE parent_id IS NULL --
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