cardinality
C2CEFR level
75/100Rarity: rare
TechnicalRegister
The number of distinct values a data field can take, ranging from few (low) to nearly unique (high).
The customer-ID column is high cardinality, so indexing it will blow up the memory footprint.
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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