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                ## 聚合 * 為了快速得到統計數據,提供了5個聚合函數 * count(*)表示計算總行數,括號中寫星與列名,結果是相同的 * 查詢學生總數 ~~~ select count(*) from students; ~~~ * max(列)表示求此列的最大值 * 查詢女生的編號最大值 ~~~ select max(id) from students where gender=0; ~~~ * min(列)表示求此列的最小值 * 查詢未刪除的學生最小編號 ~~~ select min(id) from students where isdelete=0; ~~~ * sum(列)表示求此列的和 * 查詢男生的編號之后 ~~~ select sum(id) from students where gender=1; ~~~ * avg(列)表示求此列的平均值 * 查詢未刪除女生的編號平均值 ~~~ select avg(id) from students where isdelete=0 and gender=0; ~~~
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