Joins and Lookups

This document concerns data modelling and joins

  • What is the difference between a join using the join prefix and a join using a SELECT statement?
  • When should you join and when shouldn't you? Performance considerations?
  • Are there alternatives to joins? (Yes! Applymap!)
  • What does the Keep prefix do?

 

HIC

 

See also my blog post on the same subject: To Join or not to Join.