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Chapter 3: Introduction to SQL

Chapter 3: Introduction to SQL. Chapter 3: SQL. Data Definition Basic Query Structure Set Operations Aggregate Functions Null Values Nested Subqueries Complex Queries Modification of the Database. Data Definition Language. The schema for each relation.

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SQL

SQL. Overview Data Definition Basic Queries Set Operations Null Values Aggregate Functions Nested Subqueries Modification of the Database. History. IBM Sequel language developed as part of System R project at the IBM San Jose Research Laboratory Renamed Structured Query Language (SQL)

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SQL Sub (or Nested ) Query

SQL Sub (or Nested ) Query. Examples. Q: Find students whose GPA is below the average. The criteria itself require s a SQL statement. SELECT * FROM student WHERE gpa < (SELECT AVG(gpa) FROM student); Q: Find employees with higher than average salary.

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Natural join course - PowerPoint PPT Presentation

Chapter 3: Introduction to SQL

SQL

SQL Sub (or Nested ) Query