Query involving 3 tables

Question

Am very new to this, so pls bear with me....
I have 3 tables, A, B and C
A and B have a common column
B and C have a common column
I'm trying to get a list (in english) of all items in B that are not in C. I need A because it has the english description. Which of the join types should be used?
Thanks

Answer 1

Hi,
Welcome to the forum!
Whenever you ask a question, remember that the people who can help you usually don't know anything about your tables or your data, and that intelligent answers depend on those things.
Always post CREATE TABLE and INSERT statements for a little sample data, and the results you want from that data.
Depending on your tables, your data, and your requirements, MINUS might be the best solution.
Other possibilities include EXISTS, outer-join, or IN.
For example
SELECT     a.english_description
FROM     a
JOIN     b     ON     a.common_column_ab     = b.common_column_ab
WHERE      b.common_column_bc NOT IN (
                         SELECT     common_column_bc
                         FROM     c
                         WHERE     common_column_bc     IS NOT NULL
                         );