Using joiner we can remove duplicate rows
Union will not remove duplicate rows
Joiner can be Normal,Right Outer,Left Outer,Full Outer Join
Union is equlivalent to UNION ALL in SQL
In Joiner we have one input group and one output group
In Union we have multiple input groups and one output group.
Joiner implemented by using Joiner Transformation in Informatica.
Union implemented by using Union Transformation in Informatica
Joiner Transformation combines data record horizontally based on a join condition
Union Transformation combines data record vertically from multiple sources
Joiner supports both homegenousand heterogenous
Union also supports hetregenous(different sources)