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Example1

Example1. σ age>= 30 (Person). σ age>=weight (Person). Example2 σ rating > 8 (Employee) σ sname = “Jamal” (Employee). name, hobby (Person) . .  Hobby (Person). Example4. R S R x S. S. R. Example5. R X S. Example.

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Example1

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  1. Example1 • σage>= 30 (Person) • σage>=weight (Person)

  2. Example2 • σrating > 8 (Employee) • σsname = “Jamal” (Employee)

  3. name, hobby (Person) .  Hobby (Person)

  4. Example4 R S R x S

  5. S R Example5 R X S

  6. Example

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