Why JOIN operator is used in pig

Question

Hi,

Can anyone explain what JOIN operator is and how does it work in pig?

Answer 1

Hey,

In Apache pig, JOIN operator is used to combine records from two or more relations. While performing a JOIN operation, we declare one or group of tuples from each Relation, as keys. When these keys match, the two particular tuples are matched. JOIN can be of following types:

• Self-join
• Inner-join
• Outer-join