Different camera manufacturers often use different naming conventions for the same data and some camera EXIF keys are not SQL-legal. Having the ability to standardize the names of keys can be useful. I could not find anything in the .ExifTool_config which did this.
For those who don't run a parallel database and write their own EXIF extraction and reporting tools, this feature could be easily added to the current tools (and a batch of Brownies might help).
select * from exif_trans order by 1 -> 18 rows
camera_key, db_key, tid
ActiveD-Lighting, ActiveDLighting, 28 << SQL variables may NOT contain a dash or dot
ActiveD.Lighting, ActiveDLighting, 1
ApproximateFocusDistance, FocusDistance, 44 << Exact or NOTHING
Blacks2012, Blacks_acr, 32
Brightness, BrightnessValue, 2 << Appending VALUE to a Key may cause HASH confusion
CameraProfile, CameraProfile_acr, 42
Clarity2012, Clarity_acr, 33
Contrast2012, Contrast_acr, 34
Exposure2012, Exposure_acr, 35
Highlights2012, Highlights_acr, 36
ImageNumber, ShutterCount, 27 << adope trolls destroying NIKON data and write protecting the key so you can't (easily) undo their tampering
LuminanceSmoothing, NoiseLuminance_acr, 29
Shadows2012, Shadows_acr, 37
Sharpen.Amount, Sharpness_acr, 39
Tint, Tint_acr, 41
ToneCurvePV2012, Level_high_acr, 38
Vibrance, Vibrance_acr, 40
Whites2012, Whites_acr, 31