SQL-ADVANCED5 MIN READ
Handle a Code Review on CTE Pushdown Without Hand-Waving
Coach a teammate through the tradeoff between readable CTEs, reuse, and predicate pushdown.
Lena L Senior Data Analyst 01 Respect intent 02 Show the plan 03 Offer the surgical fix The PR moment dashboard regression The SQL is clearer, but the plan now builds a huge intermediate result before parent filters cut it down. This is a planning-boundary problem, not a readability problem. 5 CTEs refactor under review 4x slower dashboard regression after merge candidate Reuse → Pushdown → Surgical fix
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