What is the function of the 'id' parameter in the alJoin action?

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Réponse

The 'id' parameter (aliased as 'idVar') specifies the identifier column that is used to join the data table and the annotation table.
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Other questions about alJoin
What are the required parameters for the alJoin action? How do you specify the tables to be joined? Which types of joins does the alJoin action support? What is the purpose of the alJoin action? How is the output of the alJoin action specified?
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