Q: Does foreign keys affect NATURAL JOINs?
SQLite 3.6.18 sample (NO foreign keys):
CREATE TABLE t1 (a INTEGER PRIMARY KEY, b INTEGER NOT NULL);
CREATE TABLE t2 (x INTEGER PRIMARY KEY, y INTEGER NOT NULL);
SELECT * FROM a NATURAL JOIN b; -- Cartesian product!
SQLite 3.6.19 sample (using foreign keys):
CREATE TABLE t1 (a INTEGER PRIMARY KEY, b INTEGER NOT NULL);
CREATE TABLE t2 (x INTEGER PRIMARY KEY, FOREIGN KEY(y) REFERENCES t1(a) );
SELECT * FROM a NATURAL JOIN b; -- Inner join??
I haven't tested this. Does this NATURAL JOIN produce an inner join or a
cartesian product?
Anyway, I think this should be documented.
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