Det afhænger virkelig af, hvilken slags join du ønsker (ydre eller ej), men du kan bruge standard SQL-syntaks.
For eksempel at deltage uden JOIN
søgeord:
select * from JNL1, JNL2, JNL3, JNL4,
where
JNL1.ItemID = JNL2.ItemID AND
JNL2.ItemID = JNL3.ItemID AND
JNL3.ItemID = JNL4.ItemID;
Derudover kan du gøre brug af flere INNER JOINS
for eksempel.
SELECT whatever
FROM JNL1 AS a
INNER
JOIN JNL2 AS b
ON b.ItemID = a.ItemID
INNER
JOIN JNL2 AS c
ON c.ItemID = b.ItemID
INNER
JOIN JNL2 AS d
ON d.ItemID = c.ItemID