"How to check the links between your tables? Do the values of the key between the two tables match as predicted?"
When building a data model it is important that you have a good understanding of the links between the tables of your data model. To test the link between 2 tables I want to know which values of my key exist only in table A, only in table B or in both tables. The Key Check module (subroutine + set of frontend objects) can help you with answering this question.
Key Check overview
Statistics of your keys in a blink
Flexible - Check multiple keys with the same frontend objects
Improve your understanding of your data model by analyzing your links/keys