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MySQL:
INTERNAL_INDEX_COLUMN_CARDINALITY
INTERNAL_INDEX_COLUMN_CARDINALITY(ARGS)
URL: https://dev.mysql.com/doc/refman/8.0/en/internal-functions.html
Example
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INTERNAL_INDEX_COLUMN_CARDINALITY(ARGS)
URL: https://dev.mysql.com/doc/refman/8.0/en/internal-functions.html