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Joins in DAX.md

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Joins

How to create Joins in DAX with / without Relationships

Standard Relationship in DAX

  • When a Data Model has more than one table, it is possible to have a Relationship between them.
  • The Relationship between them is used by DAX during calculations.

1. One to Many Relationship

  • The Dimension table has a unique row and for every row, there are multiple rows in the Fact table.

2. One to One Relationship

  • The columns in both table have unique values.

Important Points

  • Only a single Column in both the tables can be used to create or define the Relationship
  • More than one column can not be used for defining any Relationship
  • We can create a new column with the combinations of multiple columns and then it can be used to create Relationship

Matching Criteria

Operators ( =, >=, <=, <> )

Self Join is not possible.

Joining without a Relationship

DAX Functions which help us to Calculate without a Standard Relationship.

  1. CROSSJOIN : Cartesian Product ( Columns Names of both the tables should be different )

  2. GENERATE :

  3. NATURALINNERJOIN : Matching values with the same column name and data type in both the tables.

  4. NATURALLEFTOUTERJOIN : All the values of the first table and the matching values of the second table.

  5. UNION : A table that containes all the rows from both the tables including duplicates ( Same column name and numbers )

  6. EXCEPT : Create a table except few rows based on the given condition.

  7. INTERSECT : Only the common rows in both the tables.