Dołącz do nich wszystkich:
SELECT t1.col1, t1.col2, t2.colA, t2.colB, t3.colTest, t3.colBlah
FROM tab1 AS t1
CROSS JOIN tab2 AS t2
CROSS JOIN tab3 AS t3
Dołącz do nich wszystkich:
SELECT t1.col1, t1.col2, t2.colA, t2.colB, t3.colTest, t3.colBlah
FROM tab1 AS t1
CROSS JOIN tab2 AS t2
CROSS JOIN tab3 AS t3