You need to create a "super-set" of the 2 datasets containing the key columns and then use that in the middle of the query using Outer joins
Stage 1: create a UNION query to get the full set of unique keys from MTO and NMTO. This should contain the 225 records which form the superset.
Stage 2: create a second query which includes this UNION query plus the MTO and NMTO. Set the joins to include everything from UNION query and matching records from MTO; do exactly the same for the join between the UNION query and NMTO.
This should now return the 225 records.
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EDIT: worked example
Assuming 2 tables (or queries), mto
and nmto
with a consistent ID field(s) on which to join, the following query would work:
SELECT superset.id, mto.mto_1, mto.mto_2, nmto.nmto_1, nmto.nmto_2
FROM ((SELECT mto.id from mto UNION SELECT nmto.id from nmto) AS superset
LEFT JOIN mto ON superset.id = mto.id)
LEFT JOIN nmto ON superset.id = nmto.id;
You can extend this approach to include more than 2 tables, with the superset at the centre. Any questions please comment below and I will provide a screen shot and/or further information.