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유형에 열거 값을 확인합니다 :PostgreSQL의 함수는 배열
CREATE TYPE equipment AS ENUM ('projector','PAsystem','safe','PC','phone');
CREATE TYPE building_code AS ENUM ('IT','EMS','HSB','ENG');
테이블 :
CREATE TABLE venue (
id INTEGER DEFAULT NEXTVAL('venue_id_seq')
, building_code building_code
, floorNo int
, roomNo int
, width int
, length int
);
CREATE TABLE lecture_room (
id INTEGER DEFAULT NEXTVAL('lecture_id_seq')
, seatCount int
, equipment equipment[]
) INHERITS(venue);
기능 :
CREATE or REPLACE FUNCTION hasProjector(_id int) RETURNS boolean AS
$$
code to check if there exists a projector in the equipment array of lecture_room
$$ LANGUAGE SQL;
는 SQL에 나는 100 % 확실하지 코드를 함수에 넣고 결과로 부 울린을 얻는 방법.
SELECT TRUE
FROM lecture_room
WHERE id = _id
AND 'projector' = ANY (equipment)
반환 TRUE 또는 NULL :