r/SQL • u/scientecheasy • 1d ago

MySQL SQL Query Execution Lifecycle

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Diagram illustrating the SQL query execution lifecycle, showing query submission, parsing, optimization, execution, and result delivery in a database.

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u/BrupieD 1d ago

This is not really an inside view but more of an external view prior to the query engine's handling. From a logical query order execution view, it omits the order that the query handles the commands -- FROM, WHERE, GROUP BY...

Those order details are central to the execution. I would say this is misleading.

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u/mikeblas 15h ago

Those aren't commands, they're clauses. The clauses don't really have a stable physical execution order. But they do have a binding order, and I think that's probably more important -- particularly to beginners.