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Query to find delta / exceptions between 2 tables

Last Modified: 2021-04-21
I have two tables (tableA, tableB) which basically contain the same data.  The key between the 2 is serial_number.  I need a query to return the delta between the 2 tables.

TableA contains all the data that should be in TableB but that is not the case.  I need to determine which serial numbers from TableA are not appearing in TableB.
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