SQL Functions You Will Actually Use in Data Work

Most SQL tutorials stop at SELECT, WHERE, and GROUP BY. That covers retrieval, but it does not cover the layer of work that happens between raw data and a meaningful result. In financial data environments — transaction records, reconciliation tables, KYC logs — the real analytical work depends on functions and operators that transform, filter, combine, and rank data before it becomes useful. This article covers six categories of SQL functionality that come up repeatedly in practice: row-level fu