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更新しました 2024/11/01
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cardinality
Applies to: Databricks SQL Databricks Runtime
Returns the size of expr.
expr
cardinality(expr)
expr: An ARRAY or MAP expression.
An INTEGER.
> SELECT cardinality(array('b', 'd', 'c', 'a')); 4 > SELECT cardinality(map('a', 1, 'b', 2)); 2