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<>Oracle数据库SQL语句（四）
子查询（嵌套查询）
1、单行子查询
SELECT * FROM stu WHERE ID > (SELECT ID FROM stu WHERE NAME ='王五');
2、多行子查询
--IN 在什么范围内 SELECT * FROM stu WHERE ID IN (SELECT ID FROM stu WHERE CLASS =
'一班'); --ANY：表示任意的 --= ANY ：和子查询中任意一个结果相等即可，相当于IN； SELECT * FROM stu WHERE ID =
ANY ( SELECT ID FROM stu WHERE CLASS = '一班'); --< ANY ：比子查询返回的任意一个结果小即可，即小于返回结果
SELECT * FROM stu WHERE ID < ANY ( SELECT ID FROM stu WHERE CLASS = '一班'); -->
ANY ：比子查询返回的任意一个结果大即可，即大于返回结果 SELECT * FROM stu WHERE ID > ANY ( SELECT ID FROM
stuWHERE CLASS = '一班'); --ALL：表示所有的 --= ALL ：无意义，逻辑上也不成立。 SELECT * FROM stu
WHERE ID = ALL ( SELECT ID FROM stu WHERE CLASS = '一班'); --< ALL
：比子查询返回的所有的结果都小，即小于返回结果的最小值 SELECT * FROM stu WHERE ID < ALL ( SELECT ID FROM
stuWHERE CLASS = '三班'); --> ALL ：比子查询返回的所有的结果都大，即大于返回结果的最大值 SELECT * FROM stu
WHERE ID > ALL ( SELECT ID FROM stu WHERE CLASS = '三班');
3、多列子查询
--多列子查询 SELECT ID,NAME,CLASS FROM stu WHERE ID IN ( SELECT MAX(ID) FROM stu
GROUP BY CLASS);
4、相关子查询
--相关子查询中，内部查询需引用外部查询的列，进行交互判断。 --相关子查询的执行方式是一行行操作。 --外部查询每执行一行操作，内部查询都要执行一次。
SELECT ID,NAME,CLASS FROM stu WHERE ID > (SELECT AVG(ID) FROM stu WHERE CLASS =
'三班');
