Relational Operations

• We will consider how to implement:

  • Selection ( ) Selects a subset of rows from relation.
  • Projection ( ) Deletes unwanted columns from relation.
  • Join ( ) Allows us to combine two relations.

• Since each op returns a relation, ops can be composed! After we cover the operations, we will discuss how to optimize queries formed by composing them.

Previous slide

Next slide

Back to first slide

View graphic version