Latest articles, tutorials, and deep dives from ndlab tech blog.
SQL is easy to start and hard to master. This post covers every JOIN type, GROUP BY traps, subqueries, and the mental model that makes complex queries feel obvious.
Bad schema design creates bugs invisible until production. Learn the relational model from first principles, then normalize to 3NF/BCNF with real examples and trade-offs.
Most developers use databases without knowing why they exist. Learn what a DBMS really does, why flat files fail at scale, and the trade-offs that make databases essential.
Divide and conquer is behind merge sort, binary search, and fast power. Master the split-solve-merge pattern and the Master Theorem for complexity analysis in one focused post.
Greedy algorithms are easy to implement but hard to justify. Learn the exchange argument, the 5 greedy patterns, and when greedy fails so you know to reach for DP instead.
DP is not about memorizing problems. Recognize two signals — optimal substructure and overlapping subproblems — then apply 6 patterns that make DP finally approachable.
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