Sumif / Count across multiple tables

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I have two tables set up. One is a masterdatabase table and the other is a summary table.

The masterdatabase contains a field titled "YearMonth" which contains the year and month for each incident.

In the summary table I also have a "YearMonth" field as well as an "Number of incidences" field.

I want to create query which counts the number of incidences for each yearmonth.

I've tried the following expression without anyluck.

Expr1: Sum([masterdatabase.yearmonth]=[summarytable.yearmonth])

Any suggestions would be very helpful
 

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