Hi, it maybe that I can work out how to do this but i'm honestly not sure where to begin, so i'm after some help with where to start looking...
The quandry is this:
I have a table that lists Ingredient and the allergens in them (e.g.)
Ingredient 1 | Allergen 1
Ingredient 1 | Allergen 2
Ingredient 2 | Allergen 1
Ingredient 2 | Allergen 3
I need to identify all the products that DO NOT contain an allergen and put it into a report.
I've used a concatenate function to list all the ones that DO contain it (e.g. all the products containing Allergen 1), but i'm not sure where to begin with the ones that DON'T....?
When I tried <>Allergen 1 of course the results included products that contain other allergens but ALSO contain Allergen 1.
Any suggestions on where to look for possible resolutions to this?, the only resolution I can think of now means making a query for every allergen (all 15 of them)... which i'd rather not do...
Thank you.
The quandry is this:
I have a table that lists Ingredient and the allergens in them (e.g.)
Ingredient 1 | Allergen 1
Ingredient 1 | Allergen 2
Ingredient 2 | Allergen 1
Ingredient 2 | Allergen 3
I need to identify all the products that DO NOT contain an allergen and put it into a report.
I've used a concatenate function to list all the ones that DO contain it (e.g. all the products containing Allergen 1), but i'm not sure where to begin with the ones that DON'T....?
When I tried <>Allergen 1 of course the results included products that contain other allergens but ALSO contain Allergen 1.
Any suggestions on where to look for possible resolutions to this?, the only resolution I can think of now means making a query for every allergen (all 15 of them)... which i'd rather not do...
Thank you.