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RANGE frame
Learn RANGE frame in SQL through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.
RANGE frame is an atomic SQL topic inside Window Functions. This lesson focuses on how the RANGE frame construct is written, what it changes, and when it is the right tool.
Trace the example line by line. Identify the exact syntax for RANGE frame, the input state before it runs, and the resulting value, control flow, database state, hardware behavior, or runtime effect afterward. Neighboring lessons use different constructs rather than renamed copies of this one.
Topic-specific example
SELECT amount,SUM(amount) OVER (ORDER BY amount RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM payments;
For RANGE frame, test the boundary that belongs to this exact feature rather than a generic failure case. Check invalid or empty input, NULL/unknown state, numeric limits, transaction or exception behavior, synthesis/runtime constraints, ownership/permission rules, or backtracking/control-flow effects where they apply.