snowflake.snowpark.functions.var_pop¶
- snowflake.snowpark.functions.var_pop(e: Union[Column, str]) Column[source] (https://github.com/snowflakedb/snowpark-python/blob/v1.16.0/src/snowflake/snowpark/functions.py#L1068-L1092)¶
Returns the population variance of non-NULL records in a group. If all records inside a group are NULL, a NULL is returned. The population variance of a single row is 0.0.
Example:
>>> df = session.create_dataframe([1, -1, 1, -1, -1], schema=["a"]) >>> df.select(var_pop(col("a"))).collect() [Row(VAR_POP("A")=Decimal('0.960000'))] >>> df = session.create_dataframe([1, None, 2, 3, None, 5, 6], schema=["a"]) >>> df.select(var_pop(col("a"))).collect() [Row(VAR_POP("A")=Decimal('3.440000'))] >>> df = session.create_dataframe([None, None, None], schema=["a"]) >>> df.select(var_pop(col("a"))).collect() [Row(VAR_POP("A")=None)] >>> df = session.create_dataframe([42], schema=["a"]) >>> df.select(var_pop(col("a"))).collect() [Row(VAR_POP("A")=Decimal('0.000000'))]