grain
A2CEFR level
12/100Rarity: common
TechnicalRegister
The level of detail that a single row in a fact table represents.
Define the grain first: is one row a whole order or a single line item?
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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