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I have a access union query on multiple queries (about 25), but it runs very slow even with 2-3 rows/each query. What can do in this case

Can I write a DSum function in query, with two criteria? that is, I want to collect quantities according to products from the beginning of the year to a certain date which is the date field in a form. I am trying to do a thing like this: =DSum("[qty]","salestbl","[PRODUCT H NAME] = “ field in...