Nested Expression Lookup


I need to do a nested lookup on a query tag of datatype Dataset.
I want to pull back a datatype string from Tag type Expression.
My expression will do lookup()
My data has a bay number column and preset number column. I want to look for bay number X AND preset number Y. This correlation should only give me 1 row and then i want to return the value in column “file_code”.
Is there a simple way using expression language?

Don’t think it’s possible,

If you exclude my answer in that topic. My view() expression function certainly can perform multiple comparisons in a WHERE clause.

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Much Appreciated.
Installed the module, tried a few versions of the view() code and got it working!!!
Thanks for the quick answer!

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