Learning pathsql
SQL Optimization Path
Train query-plan judgment: composite indexes, selectivity, windows, recursion, and scale-aware aggregation.
Path reward
Query Optimizer
Backend engineers, data engineers, and senior candidates who need SQL performance instincts.
Demo progress: start the first mission to begin tracking.
Plan reader
Connect WHERE, JOIN, ORDER BY, and index shape. Required clears: 2.
Scale defender
Spot cardinality traps and unstable windows. Required clears: 5.
Optimizer
Explain performance tradeoffs like a production owner. Required clears: 8.
Mission chain
Step 1
Stabilize query plan index choice
Medium SQL arena: index selectivity, WHERE clauses, and explain-plan reasoning
Step 2
Harden query plan index choice
Hard SQL arena: index selectivity, WHERE clauses, and explain-plan reasoning
Step 3
Harden window ranking leaderboard
Hard SQL arena: RANK, ROW_NUMBER, partitions, and deterministic tie breakers
Step 4
Rescue query plan index choice
Extreme SQL arena: index selectivity, WHERE clauses, and explain-plan reasoning
Step 5
Rescue retention cohort matrix
Extreme SQL arena: date bucketing, joins, and cohort aggregation
Step 6
Master query plan index choice
Insane SQL arena: index selectivity, WHERE clauses, and explain-plan reasoning
Step 7
Master recursive org chart
Insane SQL arena: recursive CTEs, depth limits, and cycle safety
Step 8
Master window ranking leaderboard
Insane SQL arena: RANK, ROW_NUMBER, partitions, and deterministic tie breakers