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Database Systems SQL: Advanced Queries

Database Systems SQL: Advanced Queries

Database Systems SQL: Advanced Queries. Union, Intersection, and Except (1). SQL supports three set operations: union, intersect, minus Union compatibility is required. Consider the following two relations: Students(SSN, Name, GPA, GRE, DeptName) Instructors(SSN, Name, Office, DeptName).

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677 views • 55 slides
Database Systems SQL: Advanced Queries

Database Systems SQL: Advanced Queries

Database Systems SQL: Advanced Queries. Union, Intersection, and Except (2). Find the names of those people who are either a graduate student or an instructor or both in CS department. select Name from Student where DeptName='CS' union select Name from Instructor where DeptName='CS'

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711 views • 55 slides
Fundamentals of Database Systems Fourth Edition El Masri & Navathe Instructor: Mr. Ahmed Al Astal

Fundamentals of Database Systems Fourth Edition El Masri & Navathe Instructor: Mr. Ahmed Al Astal

Fundamentals of Database Systems Fourth Edition El Masri & Navathe Instructor: Mr. Ahmed Al Astal. Chapter 8 ( Cont .) SQL-99: Schema Definition, Basic Constraints, and Queries. SQL: USE OF DISTINCT To eliminate duplicate tuples in a query result, the keyword DISTINCT is used

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423 views • 23 slides
Fundamentals of Database Systems Fourth Edition El Masri & Navathe

Fundamentals of Database Systems Fourth Edition El Masri & Navathe

University Of Palestine. Fundamentals of Database Systems Fourth Edition El Masri & Navathe. Chapter 8 (Cont.) SQL-99: Schema Definition, Basic Constraints, and Queries. Database Management CH 8. University Of Palestine. SQL: USE OF DISTINCT

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893 views • 22 slides

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