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Asked: 2026-05-23T03:13:55+00:00

I’m new to foreign key constraints. I will formulate a simple example to explain

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I’m new to foreign key constraints. I will formulate a simple example to explain my situation.

I have a table user and a table entry. In user there is a user.firstEntry which is a foreign key to entry.EntryID. In entry there is a entry.userID which is a foreign key to the user.userID table. These IDs are all auto increment values.

Are cycles like that forbidden? Then I will have to change the design?

I am not able to insert some valid entry into both tables, because the first insert already says that there’s a problem with the constraints. Auto commit is off.

What shall I do?

Thanks

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1 Answer

  1. Editorial Team

    Bit strange design, but you can do this :

    When creating a User, set firstEntry to NULL.
    Insert an Entry with that user’s id.
    Update Users and set firstEntry to the id of the inserted entry.

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