superman183 wrote:
> Hoping someone can assist me with a query I have.
>
> I have two tables, both of which have at least one field of the same
> name, type, etc, etc. This field I will call SKEY, for the purposes of
> this post. SKEY is a CHAR field, 4 chars in length.
>
> One of the tables, we'll say Table1, has the complete list of
> available SKEY's. Table2, on the other hand, contains only some of the
> available SKEY's.
>
> I want to be able to find out which SKEY's are missing from Table2;
> ie. which SKEY's are in Table1, but not in Table2.
>
> I have tried several different queries, but generally end up in a bit
> of a mess, more often returning tens of thousands of results, when in
> fact there are only a couple of hundred records in total.
>
> My pseudo-code would be something like:
>
> SELECT SKEY FROM TABLE1 WHERE TABLE1.SKEY NOT LIKE TABLE2.SKEY
>
> The basic query which I tried is:
>
> SELECT TABLE1.SKEY FROM TABLE1 JOIN TABLE2 WHERE TABLE1.SKEY NOT LIKE
> TABLE2.SKEY
>
> I also tried a few variations, with DISTINCT, etc, etc ... but I never
> end up with anything close to what I need.

If SKEY in TABLE2 cannot be null.

SELECT TABLE1.SKEY FROM TABLE1
LEFT JOIN TABLE2 ON TABLE2.SKEY = TABLE1.SKEY
WHERE TABLE2,SKEY IS NULL;
--
Rik Wasmus
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