SELECT
A.CODE,
B.NOTE,
C.NUMBER
FROM A
INNER JOIN B ON A.CODE = B.CODE
INNER JOIN C ON A.CODE = C.NUMBER
non c'è bisogno di WHERE cluse
SELECT
A.CODE,
B.NOTE,
C.NUMBER
FROM A
INNER JOIN B ON A.CODE = B.CODE
INNER JOIN C ON A.CODE = C.NUMBER
non c'è bisogno di WHERE cluse