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create a foreign key allowing one to one tables relationships

Our Primary Key and Foreign key constraints always have allowed creaing and ensuring '1 to many' table relationships. After researching, there is no direct way to implement such a case with Informix. The only safe way is to create a primary key on the 'parent' table, a unique index on the 'child' table plus a trigger with references that will catch insert and delete. This trigger will fire a SPL that will count the rows in the parent table matching the new key. If 1 row, the child row is created, else the SP returns an error. Same principle for DELETE

  • Guest
  • Sep 17 2019
  • Future consideration
Who would benefit from this IDEA? Anyone who needs to implement a one to one relationship in a safe, generic and simple way
Client Name kandooERP
How should it work?

MS SQL Server has this feature, which is pretty well described in this URL  https://www.tech-recipes.com/rx/56738/one-to-one-one-to-many-table-relationships-in-sql-server/

This kind of relationship can be created using Primary key-Unique foreign key constraints with MS Sql Server, and I suggest to use the same principle

Idea Priority Medium
  • Guest commented
    2 Dec, 2020 08:20pm

    All you have to do is to create a PRIMARY KEY or UNIQUE constraint on the child table's foreign key column that points back to the parent table. Then the child table can only have a single row that references each parent table row. No need to formalize this in syntax!


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