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Combining information from multiple tables using JOIN (INNER, LEFT, RIGHT). Using subqueries and aggregate functions ( SUM , AVG , COUNT ). 5. Database Design Basics Creating tables ( CREATE TABLE ). Defining data types and constraints. Why "Understanding SQL" Remains Relevant
Using AND / OR conditions, WHERE clauses, and filtering to pinpoint data. martin gruber understanding sql pdf download updated
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: Master COMMIT , ROLLBACK , and SAVEPOINT to ensure data atomicity.
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