Postgres选择枚举数组中特定数组的位置

Question

鉴于这个例子：

表：

CREATE TABLE public.animals
(
  name character varying(64),
  whitelist animal_whitelist[]
)

自定义枚举类型animal_whitelist：

CREATE TYPE public.animal_whitelist AS ENUM
  ('dog',
  'cat',
  'bird');

如何专门选择白名单。

在伪代码中，这是我想要选择的。

• animal_whitelist等于dog的任何行
• animal_whitelist等于dog和cat的任何行
• animal_whitelist等于dog或cat的任何行
• animal_whitelist不是dog，cat或bird的任何行

Answer 1

请检查这个one：

    insert into animals ("name", "whitelist") values ('bobic', array['dog']::animal_whitelist[]);
insert into animals ("name", "whitelist") values ('barsic', array['cat']::animal_whitelist[]);
insert into animals ("name", "whitelist") values ('pet', array['dog', 'cat', 'bird']::animal_whitelist[]);
insert into animals ("name") values ('jim');


-- Any rows where the animal_whitelist equals dog
select * from animals where  array['dog']::animal_whitelist[] = "whitelist" ;

-- Any rows where the animal_whitelist equals dog and cat
select * from animals where  array['dog', 'cat']::animal_whitelist[] = "whitelist" ;

-- Any rows where the animal_whitelist equals dog or cat
select * from animals where  array['dog', 'cat']::animal_whitelist[] <@ "whitelist" ;

-- Any rows where the animal_whitelist is not dog, cat, or bird
select * from animals where not array['dog', 'cat', 'bird']::animal_whitelist[] && "whitelist";

Answer 2

我想我用更多的实验来解决这个问题

1. SELECT * FROM animals WHERE whitelist @> ARRAY['dog'::whitelist]
2. SELECT * FROM animals WHERE whitelist @> ARRAY['dog'::whitelist, 'cat'::whitelist] AND NOT whitelist @> ARRAY['bird'::whitelist]
3. SELECT * FROM animals WHERE whitelist @> ARRAY['dog'::whitelist] OR whitelist @> ARRAY['cat'::whitelist]
4. SELECT * FROM animals WHERE NOT whitelist @> ARRAY['dog'::whitelist, 'cat'::whitelist, 'bird'::whitelist]