The log file that I've just attached represents my having opened the database and trying to create a Formula Category ("@MetadataTag[shutterspeed,between,0,0.009]").
The result returns 186 files, but the outcome isn't valid because after sorting, I get one value (1/256), and the rest are 1. So, what am I doing wrong? TIA.
You are running queries against the formatted tag value, which is in case of the shutter speed tag a text like 1/125.
Between cannot work with text and cannot do numerical comparisons with that.
Use betweenraw instead. See Using the Raw Value (https://www.photools.com/help/imatch/#cat_formulas.htm#a_metadata_tag?dl=h-31) in the IMatch help for details.
"@MetadataTagraw[shutterspeed,betweenraw,0,0.009]"
is probably what you want.