Access append query inconsistent

Question

I have a table creation query (combine2) which takes a query (combine) and makes it a table (linegraph). This table must reflect changes in the associated query. Currently I have assigned a macro to run the append query to reflect changes.

The problem is that no matter how the append query is called it sometimes but not always copies all the data. Sometimes it wont import the first 100 or so rows. How can I get an updating table that always matches my query?

Append Query: Combine2

INSERT INTO linegraph SELECT * FROM Combine;

Query to turn into table: Combine

SELECT * FROM Month1calc UNION
SELECT * FROM Month2calc UNION
SELECT * FROM month3calc UNION
SELECT * FROM Month4calc UNION
SELECT * FROM Month5calc UNION
SELECT * FROM Month6calc UNION
SELECT * FROM Month7calc UNION
SELECT * FROM Month8calc UNION
SELECT * FROM Month9calc UNION
SELECT * FROM Month10calc UNION
SELECT * FROM Month11calc UNION
SELECT * FROM Month12calc UNION
SELECT * FROM Month13calc UNION
SELECT * FROM Month14calc UNION
SELECT * FROM Month15calc UNION
SELECT * FROM Month16calc UNION
SELECT * FROM Month17calc UNION 
SELECT * FROM Month18calc;

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Answer 1

Try changing UNION to UNION ALL .

When you use UNION , the query only returns unique rows (ie: duplicates are removed). When you use UNION ALL , duplicates are not removed.