sql语句中any和all的用法

这两个都是用于子查询的

any 是任意一个
all 是所有

any表示有任何一个满足就返回true，all表示全部都满足才返回true  

建议使用max和min更加直观

比如
select * from student where 班级=’01’ and age > all (select age from student where 班级=’02’);
就是说，查询出01班中，年龄大于 02班所有人的同学
相当于
select * from student where 班级=’01’ and age > (select max(age) from student where 班级=’02’);

而
select * from student where 班级=’01’ and age > any (select age from student where 班级=’02’);
就是说，查询出01班中，年龄大于 02班任意一个 的 同学
相当于
select * from student where 班级=’01’ and age > (select min(age) from student where 班级=’02’); 

SELECT cno ,sno ,DEGREE from SCORE sc where sco = '3-105' and  sc.DEGREE>
 ( SELECT min(DEGREE) from SCORE where cno = '3-245') order by DEGREE desc

SELECT * FROM SCORE WHERE DEGREE>ANY(SELECT DEGREE FROM SCORE WHERE CNO='3-245')
AND CNO='3-105'  ORDER BY DEGREE DESC;

上面感觉min 更直观些

SELECT DEGREE from SCORE where DEGREE >  ANY(SELECT  DEGREE   from SCORE  WHERE CNO='3-245') 
 

SELECT ANY(SELECT  DEGREE   from SCORE  WHERE CNO='3-245')   from SCORE  ：  这种写法就不对了