Module
SQL: Querying and Updating Databases
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About
DDL and DML: CREATE/ALTER/DROP, INSERT/UPDATE/DELETE, SELECT with joins (inner/outer), aggregates and GROUP BY/HAVING, nested subqueries, set operations, NULL handling, ordering/limits. Practical use with a real RDBMS (e.g., PostgreSQL/MySQL).
Goal
Write correct SQL to create schemas, load data, and answer complex multi-table analytical and transactional queries; debug common SQL pitfalls.
Prerequisites
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