COUNT

クエリ条件に一致する行の数を返します。

SELECT COUNT(*) FROM Activities WHERE FullName = 'Anna'

COUNT(DISTINCT)

クエリ条件に一致する、null 以外の個別のフィールド値の数を返します。

SELECT COUNT(DISTINCT FullName) AS DistinctValues FROM Activities WHERE FullName = 'Anna'

AVG

カラムの値の平均を返します。

SELECT Company, AVG(AnnualRevenue) FROM Activities WHERE FullName = 'Anna'  GROUP BY Company

MIN

カラムの値の最小値を返します。

SELECT MIN(AnnualRevenue), Company FROM Activities WHERE FullName = 'Anna' GROUP BY Company

MAX

カラムの値の最大値を返します。

SELECT Company, MAX(AnnualRevenue) FROM Activities WHERE FullName = 'Anna' GROUP BY Company

SUM

カラムの値の合計を返します。

SELECT SUM(AnnualRevenue) FROM Activities WHERE FullName = 'Anna'