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Data Analytics

Join keys and cardinality

Key uniqueness and table grain predict whether matching rows will be one-to-one, one-to-many, or many-to-many.

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Chapter 19: Relational joins for analysis7 lessons · 30 min
  1. 1Join keys and cardinality4 min
  2. 2Join types and unmatched rows4 min
  3. 3Join validation4 min
  4. 4Pre-aggregation before joins4 min
  5. 5Effective-date joins4 min
  6. 6Existence and anti-joins4 min
  7. 7Challenge: Relational joins for analysis6 min
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This lesson is part of the Data Analytics course.

Example plan3 lessons · 12 min

Join keys and cardinalityRelational joins for analysis4 min
Join types and unmatched rowsRelational joins for analysis4 min
Join validationRelational joins for analysis4 min

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