The only group function that includes NULL values by default is the MIN function.
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Q12: By default,the SUM function assumes the ALL
Q13: The GROUP BY clause is used to
Q14: The COUNT(*)function is only used to count
Q15: AVG,COUNT,and STDDEV are all considered group functions.
Q16: The MIN function is used to determine
Q18: Group functions return one result per group
Q19: The MAX function can only be used
Q20: The COUNT function can be used to
Q21: A grouping sets expression can perform multiple
Q22: Pattern matching features available in a SELECT
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