DP-750 Exam Prep: Key Delta Lake and Spark Table Operations You Must Know

Microsoft's DP-750 Azure Databricks Data Engineer Associate exam frequently tests candidates on fundamental Delta Lake and Spark table operations rather than advanced optimizations. Core topics include INSERT INTO, which appends rows without deleting existing data, and INSERT OVERWRITE, which replaces existing table data entirely. Commands like CREATE TABLE AS SELECT and CREATE OR REPLACE TABLE AS SELECT are also common exam traps, each serving distinct purposes around table creation and replacement. Delta Lake table constraints such as NOT NULL and CHECK are tested for their role in enforcing data quality rules at the table level. PySpark methods like dropna and fillna are similarly assessed, with the exam distinguishing between removing null rows versus replacing null values.