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                子查詢相比于表連接,更加適合寫where條件、另外增刪改如果涉及到2張及以上的表,也更適合用子查。 ```sql 語法:該語句完成如下查詢,共涉及到3張表。 -- 1. 查詢result表的所有記錄 -- 2. 查詢student表的studentName列 -- 3. 查詢student表的phone列 -- 4. 查詢subject表的subjectNname列 select *, (select studentName from student where studentno=result.studentNo) as studentName, -- 第一個子查詢, (select phone from student where studentno=result.studentNo) as phone -- 第二個子查詢, (select subjectName from `subject` where subjectNo=result.subjectNo) as subjectName -- 第三個子查詢 from result where studentResult<60 order by studentNo asc; -- order by studentNo asc 表示按升序排序(默認) -- order by studentNo desc 則是按降序排序 -- order by studentNo 則是默認,按升序排序 ```
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