如何从VARRAY检索数据并对其进行过滤

Question

我必须从Varray检索特定数据，例如

CREATE OR REPLACE TYPE class_t IS VARRAY(9) OF VARCHAR(5);/   
create table exprement(name VARCHAR2(20), seat class_t);
insert into exprement(name,seat) values('JPZ',class_t('AC1','EC'));
insert into exprement(name,seat) values('ABC',class_t('GEN','EC'));
insert into exprement(name,seat) values('DFG',class_t('AC1','EC'));

我想检索VARRAY包含AC1的名称我试过select * from exprement where seat='AC1';

Answer 1

您可以使用：

SELECT name
FROM   experiment e
WHERE  EXISTS (SELECT 1 FROM TABLE(e.seat) WHERE COLUMN_VALUE = 'AC1');

或

SELECT name
FROM   experiment e
CROSS APPLY TABLE (e.seat) s
WHERE  s.COLUMN_VALUE = 'AC1';

---

顺便说一句，如果将seat定义为嵌套表(而不是VARRAY)，则可以使用MEMBER OF运算符：

SELECT *
FROM   experiment
WHERE  'AC1' MEMBER OF seat;

但这对VARRAY或关联数组不起作用。

db<gt；小提琴这里