ms access - SQL based on complex criteria -


i'm struggling sql statement i'm trying write in ms access , appreciate help.

i have table:

 ***************************  * attr1 * attr2 *  attr3  *  ***************************  *       *     *   1     *  *       *  b    *   2     *  *       *  b    *   3     *  *       *  c    *   4     *  *   b   *       *   1     *  *   d   *       *   1     *  *     *       *   2     *  ***************************

i need result this:

 ***************************  * attr1 * attr2 *  attr3  *  ***************************  *   b   *       *   1     *  *   d   *       *   1     *  *     *       *   2     *  *       *  b    *   3     *  *       *  c    *   4     *  ***************************

so, need in result rows attr1 not null, , other rows attr3 has different values in rows attr1 not null.

i can in access in way make 1 query select rows attr1 not null, 1 "find unmatched" query select rows values in attr3 not included in first query, , make union of 2 queries... need more direct approach (one sql statement if possible).

thank much!

i think need this:

select attr1, attr2, attr3 table attr1 not null        or attr3 not in (select attr3 table attr1 not null)

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