A database schema is like a blueprint that defines how data is organized and stored in a database . It describes the structure of tables, columns, data types, relationships, constraints, and indexes, providing a clear framework for how different pieces of data are stored and connected. 🔑 Key Points Schema = Structure → Defines tables, columns, and rules. Ensures consistency → Data must follow the schema (e.g., a column defined as INT cannot store text). Relationships → Specifies how tables connect (foreign keys, primary keys). Constraints → Rules like NOT NULL , UNIQUE , CHECK .
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