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Does MySQL Support CONNECT BY? Hierarchical Queries Explained
MySQL is one of the world's most widely used relational database systems — but developers migrating from Oracle or working with hierarchical data often hit a wall when they search for the CONNECT BY clause. Here's what's actually going on, what MySQL offers instead, and what shapes the right approach for any given situation.
What Is CONNECT BY and Where Does It Come From?
CONNECT BY is a hierarchical query clause native to Oracle Database. It lets you traverse tree-structured data — like organizational charts, category trees, or bill-of-materials records — in a single, readable SQL statement.
A classic Oracle query looks like this: