Hello. I'm quite new to Access and have inherited a database from a colleague. It is a database of references from which we have extracted pesticide active ingredient, pest species and crop species using forms. I am trying to create a query that will allow us to search and return unique active ingredient x pest x crop species combinations (but which will return all instances of this combination).
The complication is that the pest and crop species names are within the same field ('taxa'). They are distinguished by a label ('pest' or 'crop') in an associated field ('PestorPredator'), but a query using 'OR' will only return a crop OR pest, whilst a query using 'AND' will return no records (because something can't be a pest AND and crop).
I want to be able to create a table that shows the active ingredient, associated pest species AND the associated crop species each in separate columns. We have tried a couple of methods, including UNION and UNION ALL, and I can post the SQL script if someone thinks they may be able to help. Also, please ask for any more detail you need; I'm not sure the best way to explain the issue.
It'd be very much appreciated. Thanks.
The complication is that the pest and crop species names are within the same field ('taxa'). They are distinguished by a label ('pest' or 'crop') in an associated field ('PestorPredator'), but a query using 'OR' will only return a crop OR pest, whilst a query using 'AND' will return no records (because something can't be a pest AND and crop).
I want to be able to create a table that shows the active ingredient, associated pest species AND the associated crop species each in separate columns. We have tried a couple of methods, including UNION and UNION ALL, and I can post the SQL script if someone thinks they may be able to help. Also, please ask for any more detail you need; I'm not sure the best way to explain the issue.
It'd be very much appreciated. Thanks.