Trying to make a complex View (3 tables, 2 outer joins) and struggling

[DaveS]

I'm trying to create a View across 3 tables.  Let's say I'm having a dinner party and I have the tables
a. Guests
b. Food Items
c.  Exclusions (this is a list of Guest / Food Combinations that are not valid - e.g., guest is allergic to this item).

I'm trying to create a view that has every combination of Guests and Foods, and includes Exclusions if it exists and matches the combination of guest and food.  

Would love to get some help with this - have been wrestling with every combination of inner and outer join I can think of and I'm not getting there.  

It seems like this shouldn't be that hard, but I either get only rows with C or I get a single exclusion matching to a bunch of records it shouldn't.

Thanks in advance

[DaveS]

I didn't have the vocabulary to describe what I was trying to do, but I now know that it's called a Cross Join and there was a great post here that rescued me after way too much time struggling with it. 

 

The Solution to CrossJoin in Caspio

[CoopperBackpack]

Hello @DaveS,

FYI: Cross Join is extremely helpful for some use cases. Actually, it can be the only solution that helps to achieve the result (as your use case).

However, since it creates all possible combinations, it is considered to be rather slow. So, just be aware of the slow View. At least, when it is opened for the first time, after that on the back end the query and values should be cached.
Here is the helpful external article https://www.sqlshack.com/sql-cross-join-with-examples/

[DaveS]

Thanks, @CoopperBackpack - I considered that and agree.  I don't have a sense for how big it has to be to be a problem.  One table has about 2500 records and is unlikely to see material growth.  The other is (basically) a b2b customer table.  The result set could be millions of records... but not until I get thousands of (b2b) customers.  I'm thinking it would be a good problem to have...