集計関数
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'