Simple summary Keys are in Dynamics AX

• There is a maximum of one Primary Key per table, whereas a table can have several alternate keys. The primary key is usually the type of key that other tables, called child tables, refer to when a foreign key field in those other tables need a relational identifier.

• For new tables the default is a primary key based on the RecId field , incremented number or a completely meaningless number that is generated by the system surrogate key.

• As The RecId data type, surrogate keys exist on a primary key table. As The RefRecId ETD, surrogate foreign keys exist on a foreign key table (Ex: Party field is on CustTable Table).

• Alternate key can be chosen as the Replacement Key of a table that can display on forms instead of a meaningless numeric primary key value. Each table can have a maximum of one replacement key.

• Natural key has meaning to people. A set of fields that uniquely identify a record and would have formed the primary key of the table, if not for the existence of a surrogate key.

• Relations represents a foreign key.

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