查询最大VARRAY值

Question

如何查询varray内的最大值？

create type myWave as varray(10) of int; 
create table foo (id number, yVals myWave); 

insert into foo values (1, myWave(1, 8, 5)); 
insert into foo values (2, myWave(1, 3, 4)); 
insert into foo values (3, myWave(9, 5, 9)); 
insert into foo values (4, myWave(8, 2)); 

不正确的SQL：SELECT id, MAX(yVals) maxY FROM foo

所需的输出：

| id | maxY | 
|----|------| 
| 1 | 8 | 
| 2 | 4 | 
| 3 | 9 | 
| 4 | 8 | 

Answer 1

SELECT t1.ID, MAX(t2.column_value) FROM foo t1, TABLE(t1.yVals) t2 group by t1.ID