SQL is the common language across every data platform: SQL Server for transactional databases, Azure SQL for cloud databases, Snowflake SQL for cloud warehouse queries, Databricks SQL for lakehouse analytics, Fabric Warehouse for T-SQL on the unified platform, and PostgreSQL for open-source. Every data analyst, data engineer, and BI developer writes SQL daily.
Enterprise SQL expertise requires: window functions (LAG, LEAD, ROW_NUMBER, RANK for analytical queries), CTEs (Common Table Expressions for readable complex queries), query optimization (execution plans, indexing strategy, statistics), and the platform-specific dialect knowledge (T-SQL for SQL Server/Azure, Spark SQL for Databricks, Snowflake SQL extensions).