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Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition by Michael D. Kennedy

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More Complex Queries—And’s and Or’s
Perhaps you are confused about AND’s and OR’s—like why you get both the left polygons and the top polygons when you use the expression
[LOCATION] =‘LEFT’ OR [PLACEMENT] = ‘TOP’
Well, it’s good that you are confused. It will make you think carefully about the Boolean expressions you put in the Query Builder. It is amazingly easy to make a mistake!
For further information click on Help on the Main menu, enter “building SQL expressions”, and press Ask.

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