Master SQL for Data Analysis - Schema, Metadata, Data Dictionary

The video tutorial explains the structure and organization of relational databases, focusing on database instances, tables, schemas, and catalogs. It highlights the role of schemas as blueprints for organizing data and the flexibility of using multiple schemas for different projects. The concept of catalogs is introduced as an additional hierarchical level. The tutorial also covers metadata, which describes the database structure, and the data dictionary, where metadata is stored. These concepts are crucial for understanding how data is stored, accessed, and managed in relational databases.

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