Question

Suppose I have table A with a field that can be either 1 or 2…

How do I select such that for each row in table A, if the field is 1, join the select with table B and if the field is 2, join the select with table C?

Answer 1

(
SELECT MyField1, MyField2 FROM A
INNER JOIN B ON A.Id = B.Id
AND A.MyField = 1
)
UNION
(
SELECT MyField1, MyField2 FROM A
INNER JOIN C ON A.Id = C.Id
AND A.MyField = 2
)