1
조직 테이블
=====================
| id | name |
-----+----------------+
| 1 | Organization 1 |
=====================
탑재 대
=================================
| id | name | organization_id |
-----+----------+-----------------+
| 1 | Place 1 | 1 |
-----+----------+-----------------+
| 2 | Place 2 | 1 |
-----+----------+-----------------+
| 3 | Place 3 | 1 |
=================================
프로파일 테이블
이러한 테이블 구조를 상상해=============
| username |
--------------
| [email protected] |
--------------
| [email protected] |
=============
Visitedplace 테이블
================================================
| id | place_id | profile_username | visiteddate |
-----+----------+---------------- -+-------------+
| 1 | 1 | [email protected] | 2017-01-01 |
-----+----------+------------------+-------------+
| 2 | 2 | [email protected] | 2017-02-01 |
-----+----------+------------------+-------------+
| 3 | 1 | [email protected] | 2017-01-15 |
================================================
다음은 테이블을 만들고 여기에 데이터를 삽입하는 SQL 문에서도 있습니다
-- ----------------------------
-- Table structure for organization
-- ----------------------------
DROP TABLE IF EXISTS "organization";
CREATE TABLE "organization" (
"id" int4 NOT NULL,
"name" varchar(255) COLLATE "default" NOT NULL
) WITH (OIDS=FALSE);
-- ----------------------------
-- Records of organization
-- ----------------------------
BEGIN;
INSERT INTO "organization" VALUES ('1', 'Organization 1');
COMMIT;
-- ----------------------------
-- Table structure for place
-- ----------------------------
DROP TABLE IF EXISTS "place";
CREATE TABLE "place" (
"id" int4 NOT NULL,
"name" varchar(255) COLLATE "default" NOT NULL,
"organization_id" int4 NOT NULL
)WITH (OIDS=FALSE);
-- ----------------------------
-- Records of place
-- ----------------------------
BEGIN;
INSERT INTO "place" VALUES ('1', 'Place 1', '1');
INSERT INTO "place" VALUES ('2', 'Place 2', '1');
INSERT INTO "place" VALUES ('3', 'Place 3', '1');
COMMIT;
-- ----------------------------
-- Table structure for profile
-- ----------------------------
DROP TABLE IF EXISTS "profile";
CREATE TABLE "profile" (
"username" varchar(255) COLLATE "default" NOT NULL
)WITH (OIDS=FALSE);
-- ----------------------------
-- Records of profile
-- ----------------------------
BEGIN;
INSERT INTO "profile" VALUES ('[email protected]');
INSERT INTO "profile" VALUES ('[email protected]');
COMMIT;
-- ----------------------------
-- Table structure for visitedplace
-- ----------------------------
DROP TABLE IF EXISTS "visitedplace";
CREATE TABLE "visitedplace" (
"id" int4 NOT NULL,
"place_id" int4 NOT NULL,
"profile_username" varchar(255) COLLATE "default" NOT NULL,
"visiteddate" date NOT NULL
)WITH (OIDS=FALSE);
-- ----------------------------
-- Records of visitedplace
-- ----------------------------
BEGIN;
INSERT INTO "visitedplace" VALUES ('1', '1', '[email protected]', '2017-02-24');
COMMIT;
-- ----------------------------
-- Alter Sequences Owned By
-- ----------------------------
-- ----------------------------
-- Primary Key structure for table organization
-- ----------------------------
ALTER TABLE "organization" ADD PRIMARY KEY ("id");
-- ----------------------------
-- Primary Key structure for table place
-- ----------------------------
ALTER TABLE "place" ADD PRIMARY KEY ("id");
-- ----------------------------
-- Primary Key structure for table profile
-- ----------------------------
ALTER TABLE "profile" ADD PRIMARY KEY ("username");
-- ----------------------------
-- Primary Key structure for table visitedplace
-- ----------------------------
ALTER TABLE "visitedplace" ADD PRIMARY KEY ("id");
-- ----------------------------
-- Foreign Key structure for table "place"
-- ----------------------------
ALTER TABLE "place" ADD FOREIGN KEY ("organization_id") REFERENCES
"organization" ("id") ON DELETE CASCADE ON UPDATE CASCADE;
------------------------------
-- Foreign Key structure for table "visitedplace"
-- ----------------------------
ALTER TABLE "visitedplace" ADD FOREIGN KEY ("profile_username") REFERENCES "profile" ("username") ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE "visitedplace" ADD FOREIGN KEY ("place_id") REFERENCES "place" ("id
") ON DELETE CASCADE ON UPDATE CASCADE;
내 질문
내가이 다음을 실행
검색어 01 23,516,select profile.username, count(distinct place.id)
from profile profile
left outer join visitedplace visitedplace on profile.username=visitedplace.profile_username
inner join place place on visitedplace.place_id=place.id
where place.organization_id=1
group by profile.username
는 다음 결과
=====================
| username | count |
-------------+-------
| [email protected] | 2 |
=====================
를 반환하지만 난 다음 결과
=====================
| username | count |
-------------+-------
| [email protected] | 2 |
-------------+-------
| [email protected] | 0 |
=====================
을 기대하고 그래서 내가 기대하고 무엇을 나에게 반환하는 쿼리를 할 수 있습니까?
나는 left join
를 사용하여 포스트 그레스
정말 (다소) 오래된 버전을 사용하고 있습니까? –
@a_horse_with_no_name ur 질문을 얻을 수 없다, pls, thnx를 명확히 할 수있다 –