FOREIGN KEY CASCADE CONTAINING NULL COLUMNS NOT CASCADING
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Key: CORE-4957
URL: http://tracker.firebirdsql.org/browse/CORE-4957
Project: Firebird Core
Issue Type: Bug
Affects Versions: 3.0 Beta 2
Reporter: Tim Kelly
SQL> CREATE TABLE X (A INTEGER PRIMARY KEY, B INTEGER);
SQL> CREATE TABLE Y (A INTEGER PRIMARY KEY, B INTEGER);
SQL> ALTER TABLE X ADD UNIQUE(A,B);
SQL> ALTER TABLE Y ADD FOREIGN KEY (A,B) REFERENCES X(A,B) ON UPDATE CASCADE;
SQL> INSERT INTO X VALUES(1,NULL);
SQL> INSERT INTO Y VALUES(1,NULL);
SQL> UPDATE X SET B = 1 WHERE A = 1;
Statement failed, SQLSTATE = 23000
violation of FOREIGN KEY constraint "INTEG_3304" on table "Y"
-Foreign key references are present for the record
-Problematic key value is ("A" = 1, "B" = NULL)
Whereas:
SQL> CREATE TABLE X (A INTEGER PRIMARY KEY, B INTEGER);
SQL> CREATE TABLE Y (A INTEGER PRIMARY KEY, B INTEGER);
SQL> ALTER TABLE X ADD UNIQUE(A,B);
SQL> ALTER TABLE Y ADD FOREIGN KEY (A,B) REFERENCES X(A,B) ON UPDATE CASCADE;
SQL> INSERT INTO X VALUES(1,0);
SQL> INSERT INTO Y VALUES(1,0);
SQL> UPDATE X SET B = 1 WHERE A = 1;
SQL> SELECT * FROM X;
A B
============ ============
1 1
SQL> SELECT * FROM Y;
A B
============ ============
1 1
I can see how this problem probably originates:
I think that NULLS should not be cascaded to the FK if all the
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