IBM Data and AI Ideas Portal for Customers


This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).


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Status Submitted
Workspace Informix
Components Informix Server
Created by Guest
Created on Mar 25, 2024

RELATED IDEAS

Support for ON DELETE SET NULL and ON UPDATE CASCADE clauses in FOREIGN KEY statements

A customer wanted to use a construction like

ALTER TABLE detail_table
ADD CONSTRAINT FOREIGN KEY (link_column)
REFERENCES master_table
ON DELETE SET NULL;


so that referencing values would be updated to NULL automatically if a parent row was deleted.

That syntax is available in some database servers - such as DB2 - but not Informix:
https://www.ibm.com/docs/en/db2/11.5?topic=constraints-foreign-key-referential

Some other databases - but not Informix or DB2 - also have

ON UPDATE CASCADE


so that referencing values would be updated to the new value automatically if the parent row was updated.

That has separately been requested for DB2:
https://ibm-data-and-ai.ideas.ibm.com/ideas/DB24LUW-I-62

Could these both be added in a future Informix release?

The work around meanwhile is to have a trigger on the primary table with constraints deferred:
https://www.ibm.com/docs/en/informix-servers/14.10?topic=statements-set-transaction-mode-statement

Needed By Quarter

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