Question

I want to convert the following query from T-SQL

SELECT
    * 
FROM
    A                            LEFT JOIN
    B ON A.field1 = B.field1     LEFT JOIN
    C ON C.field1 = A.field2 AND
         C.field2 = B.field2

to Jet SQL.
Now MS Access does not accept ambiguous queries. How can I do that? I can’t put the second comparison in the WHERE clause. Why? Because my scenario is that I am selecting records that does not exist in C.

How to select all records from one table that do not exist in another table?

Now, how do you that in MS Access? Thanks in advance for your time and expertise.

Answer 1

You need a derived table to make this work in MS Access:

SELECT * 
FROM (
   SELECT A.Field1, A.Field2 As A2, B.Field2 
   FROM A 
   LEFT JOIN B ON A.field1 = B.field1) AS x 
LEFT JOIN C ON  x.A2 = C.field1 AND  x.field2= C.field2