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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Jan 24, 2022

Foreign keys to be able to use compound indexes.

With the following the existing compound index is not used for the foreign key and another index is required. This adds overhead with additional maintenance.

create table p1 (t char(4) not null);

create unique index px1 on p1(t);

alter table p1 add constraint primary key (t) constraint p1_pk;

create table f1 ( t char(4) not null, s char(1) default 'N' not null);

create index f1_i1 on f1 (t,s);

alter table f1 add constraint (foreign key (t) references p1 (t) constraint f1_1);

Needed By Quarter