根据以前的问题答案选择 MCQ 答案计数答案

【问题标题】：Select MCQ answer count based on previous question's answer根据以前的问题答案选择 MCQ 答案计数
【发布时间】：2021-05-05 21:58:33
【问题描述】：

让我们使用具有以下结构的 PostgreSQL 数据库：

（所有关系从上到下都是OneToMany）

Brandlift 总是正好有 2 个 brandlift_question，每个都有 1 个 brandlift_answer（本身有很多 brandlift_answer_content） brandlift_respondent

目标：

给定一个“品牌”（我们称之为“旗舰品牌”）
和 brandlift.campaign_id，

对于此品牌提升的每个品牌，
按受访者细分检索，
brand.id = 'answer_content.brand_id' 第二个（右）question answers的计数，其中同一受访者的上一个（左）问题答案的answer_content.brand_id等于“旗舰品牌” id

样本数据（转储）：
https://dbfiddle.uk/?rdbms=postgres_12&fiddle=a127374b9a327204db40dc9f4e769fc1

-- -- PostgreSQL database dump -- -- Dumped from database version 12.1 -- Dumped by pg_dump version 12.3 SET statement_timeout = 0; SET lock_timeout = 0; SET idle_in_transaction_session_timeout = 0; SET client_encoding = 'UTF8'; SET standard_conforming_strings = on; SELECT pg_catalog.set_config('search_path', '', false); SET check_function_bodies = false; SET xmloption = content; SET client_min_messages = warning; SET row_security = off; SET default_tablespace = ''; SET default_table_access_method = heap; -- -- Name: brandlift; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.brandlift ( campaign_id uuid NOT NULL, respondent_goal integer NOT NULL ); ALTER TABLE public.brandlift OWNER TO postgres; -- -- Name: COLUMN brandlift.campaign_id; Type: COMMENT; Schema: public; Owner: postgres -- COMMENT ON COLUMN public.brandlift.campaign_id IS '(DC2Type:uuid)'; -- -- Name: brandlift_answer; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.brandlift_answer ( id integer NOT NULL, question_id uuid NOT NULL, respondent_id integer NOT NULL ); ALTER TABLE public.brandlift_answer OWNER TO postgres; -- -- Name: COLUMN brandlift_answer.question_id; Type: COMMENT; Schema: public; Owner: postgres -- COMMENT ON COLUMN public.brandlift_answer.question_id IS '(DC2Type:uuid)'; -- -- Name: brandlift_answer_content; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.brandlift_answer_content ( id integer NOT NULL, answer_id integer NOT NULL, brand_id integer ); ALTER TABLE public.brandlift_answer_content OWNER TO postgres; -- -- Name: brandlift_answer_content_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres -- CREATE SEQUENCE public.brandlift_answer_content_id_seq START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1; ALTER TABLE public.brandlift_answer_content_id_seq OWNER TO postgres; -- -- Name: brandlift_answer_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres -- CREATE SEQUENCE public.brandlift_answer_id_seq START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1; ALTER TABLE public.brandlift_answer_id_seq OWNER TO postgres; -- -- Name: brandlift_brand; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.brandlift_brand ( id integer NOT NULL, campaign_id uuid NOT NULL, name character varying(255) NOT NULL ); ALTER TABLE public.brandlift_brand OWNER TO postgres; -- -- Name: COLUMN brandlift_brand.campaign_id; Type: COMMENT; Schema: public; Owner: postgres -- COMMENT ON COLUMN public.brandlift_brand.campaign_id IS '(DC2Type:uuid)'; -- -- Name: brandlift_brand_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres -- CREATE SEQUENCE public.brandlift_brand_id_seq START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1; ALTER TABLE public.brandlift_brand_id_seq OWNER TO postgres; -- -- Name: brandlift_question; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.brandlift_question ( id uuid NOT NULL, campaign_id uuid NOT NULL, title character varying(255) NOT NULL ); ALTER TABLE public.brandlift_question OWNER TO postgres; -- -- Name: COLUMN brandlift_question.id; Type: COMMENT; Schema: public; Owner: postgres -- COMMENT ON COLUMN public.brandlift_question.id IS '(DC2Type:uuid)'; -- -- Name: COLUMN brandlift_question.campaign_id; Type: COMMENT; Schema: public; Owner: postgres -- COMMENT ON COLUMN public.brandlift_question.campaign_id IS '(DC2Type:uuid)'; -- -- Name: brandlift_respondent; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.brandlift_respondent ( id integer NOT NULL, campaign_id uuid NOT NULL, segment_id integer NOT NULL, aam_uuid character varying(255) DEFAULT NULL::character varying, "timestamp" timestamp(0) without time zone NOT NULL ); ALTER TABLE public.brandlift_respondent OWNER TO postgres; -- -- Name: COLUMN brandlift_respondent.campaign_id; Type: COMMENT; Schema: public; Owner: postgres -- COMMENT ON COLUMN public.brandlift_respondent.campaign_id IS '(DC2Type:uuid)'; -- -- Name: brandlift_respondent_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres -- CREATE SEQUENCE public.brandlift_respondent_id_seq START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1; ALTER TABLE public.brandlift_respondent_id_seq OWNER TO postgres; -- -- Name: brandlift_segment; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.brandlift_segment ( id integer NOT NULL, name character varying(255) NOT NULL ); ALTER TABLE public.brandlift_segment OWNER TO postgres; -- -- Name: brandlift_segment_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres -- CREATE SEQUENCE public.brandlift_segment_id_seq START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1; ALTER TABLE public.brandlift_segment_id_seq OWNER TO postgres; -- -- Name: campaign; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.campaign ( id uuid NOT NULL, format_id integer NOT NULL, advertiser character varying(255) NOT NULL, name character varying(255) NOT NULL, date_start timestamp(0) without time zone NOT NULL, date_end timestamp(0) without time zone NOT NULL ); ALTER TABLE public.campaign OWNER TO postgres; -- -- Name: COLUMN campaign.id; Type: COMMENT; Schema: public; Owner: postgres -- COMMENT ON COLUMN public.campaign.id IS '(DC2Type:uuid)'; -- -- Name: doctrine_migration_versions; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.doctrine_migration_versions ( version character varying(191) NOT NULL, executed_at timestamp(0) without time zone DEFAULT NULL::timestamp without time zone, execution_time integer ); ALTER TABLE public.doctrine_migration_versions OWNER TO postgres; -- -- Name: format; Type: TABLE; Schema: public; Owner: postgres -- CREATE TABLE public.format ( id integer NOT NULL, name character varying(255) NOT NULL ); ALTER TABLE public.format OWNER TO postgres; -- -- Name: format_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres -- CREATE SEQUENCE public.format_id_seq START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1; ALTER TABLE public.format_id_seq OWNER TO postgres; -- -- Data for Name: brandlift; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.brandlift (campaign_id, respondent_goal) FROM stdin; 8d8c79ce-188c-4f5e-bd72-edb854faf34c   500 \. -- -- Data for Name: brandlift_answer; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.brandlift_answer (id, question_id, respondent_id) FROM stdin; 28 6d6596f4-9418-4f76-9234-c3c943ca56cf    18 29   c84760de-be6f-4f8e-be32-9195846307cf    18 30   6d6596f4-9418-4f76-9234-c3c943ca56cf    19 31   c84760de-be6f-4f8e-be32-9195846307cf    19 32   6d6596f4-9418-4f76-9234-c3c943ca56cf    20 33   c84760de-be6f-4f8e-be32-9195846307cf    20 34   6d6596f4-9418-4f76-9234-c3c943ca56cf    21 35   c84760de-be6f-4f8e-be32-9195846307cf    21 36   6d6596f4-9418-4f76-9234-c3c943ca56cf    22 37   c84760de-be6f-4f8e-be32-9195846307cf    22 \. -- -- Data for Name: brandlift_answer_content; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.brandlift_answer_content (id, answer_id, brand_id) FROM stdin; 54 28  5 55    28  7 56    29  5 57    29  8 58    30  5 59    30  7 60    31  7 61    31  5 62    32  5 63    32  7 64    33  6 65    33  7 66    33  8 67    34  7 68    34  5 69    35  6 70    35  7 71    35  8 72    36  7 73    36  5 74    37  6 75    37  7 \. -- -- Data for Name: brandlift_brand; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.brandlift_brand (id, campaign_id, name) FROM stdin; 5   8d8c79ce-188c-4f5e-bd72-edb854faf34c    Nike 6  8d8c79ce-188c-4f5e-bd72-edb854faf34c    Adidas 7    8d8c79ce-188c-4f5e-bd72-edb854faf34c    Lacoste 8   8d8c79ce-188c-4f5e-bd72-edb854faf34c    Puma \. -- -- Data for Name: brandlift_question; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.brandlift_question (id, campaign_id, title) FROM stdin; 6d6596f4-9418-4f76-9234-c3c943ca56cf  8d8c79ce-188c-4f5e-bd72-edb854faf34c    Parmi les propositions suivantes, pour lesquelles avez-vous vu de la publicité vidéo en ligne au cours du dernier mois ? c84760de-be6f-4f8e-be32-9195846307cf   8d8c79ce-188c-4f5e-bd72-edb854faf34c    Si vous deviez prochainement choisir une marque de streetwear la ou lesquelles choisiriez-vous ? \. -- -- Data for Name: brandlift_respondent; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.brandlift_respondent (id, campaign_id, segment_id, aam_uuid, "timestamp") FROM stdin; 10    8d8c79ce-188c-4f5e-bd72-edb854faf34c    3   912407327014    2021-02-01 18:04:43 11  8d8c79ce-188c-4f5e-bd72-edb854faf34c    3   2692416912404   2021-02-01 18:06:01 12  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   9741094120421   2021-02-01 18:06:56 13  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   8973093247093   2021-02-01 18:07:59 14  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   2147124472178421    2021-02-01 18:08:34 15  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   2147124472178421    2021-02-01 18:09:20 16  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   23253532532352  2021-02-01 18:09:53 17  8d8c79ce-188c-4f5e-bd72-edb854faf34c    3   357325732577352 2021-02-01 18:20:01 18  8d8c79ce-188c-4f5e-bd72-edb854faf34c    3   357325732577352 2021-02-01 18:21:12 19  8d8c79ce-188c-4f5e-bd72-edb854faf34c    3   4354646464223   2021-02-01 18:22:14 20  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   6855985895808   2021-02-01 18:25:41 21  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   6855985895808   2021-02-01 18:26:03 22  8d8c79ce-188c-4f5e-bd72-edb854faf34c    4   6855985895808   2021-02-01 18:26:33 \. -- -- Data for Name: brandlift_segment; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.brandlift_segment (id, name) FROM stdin; 3  expo 4  no expo \. -- -- Data for Name: campaign; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.campaign (id, format_id, advertiser, name, date_start, date_end) FROM stdin; 8d8c79ce-188c-4f5e-bd72-edb854faf34c    2   Nike    Air Max 270 2021-01-25 00:00:00 2021-02-28 00:00:00 \. -- -- Data for Name: doctrine_migration_versions; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.doctrine_migration_versions (version, executed_at, execution_time) FROM stdin; DoctrineMigrations\\Version20210131122327  2021-01-31 13:23:34 199 \. -- -- Data for Name: format; Type: TABLE DATA; Schema: public; Owner: postgres -- COPY public.format (id, name) FROM stdin; 2    Brandlift \. -- -- Name: brandlift_answer_content_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres -- SELECT pg_catalog.setval('public.brandlift_answer_content_id_seq', 75, true); -- -- Name: brandlift_answer_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres -- SELECT pg_catalog.setval('public.brandlift_answer_id_seq', 37, true); -- -- Name: brandlift_brand_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres -- SELECT pg_catalog.setval('public.brandlift_brand_id_seq', 8, true); -- -- Name: brandlift_respondent_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres -- SELECT pg_catalog.setval('public.brandlift_respondent_id_seq', 22, true); -- -- Name: brandlift_segment_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres -- SELECT pg_catalog.setval('public.brandlift_segment_id_seq', 4, true); -- -- Name: format_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres -- SELECT pg_catalog.setval('public.format_id_seq', 2, true); -- -- Name: brandlift_answer_content brandlift_answer_content_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_answer_content ADD CONSTRAINT brandlift_answer_content_pkey PRIMARY KEY (id); -- -- Name: brandlift_answer brandlift_answer_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_answer ADD CONSTRAINT brandlift_answer_pkey PRIMARY KEY (id); -- -- Name: brandlift_brand brandlift_brand_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_brand ADD CONSTRAINT brandlift_brand_pkey PRIMARY KEY (id); -- -- Name: brandlift brandlift_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift ADD CONSTRAINT brandlift_pkey PRIMARY KEY (campaign_id); -- -- Name: brandlift_question brandlift_question_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_question ADD CONSTRAINT brandlift_question_pkey PRIMARY KEY (id); -- -- Name: brandlift_respondent brandlift_respondent_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_respondent ADD CONSTRAINT brandlift_respondent_pkey PRIMARY KEY (id); -- -- Name: brandlift_segment brandlift_segment_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_segment ADD CONSTRAINT brandlift_segment_pkey PRIMARY KEY (id); -- -- Name: campaign campaign_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.campaign ADD CONSTRAINT campaign_pkey PRIMARY KEY (id); -- -- Name: doctrine_migration_versions doctrine_migration_versions_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.doctrine_migration_versions ADD CONSTRAINT doctrine_migration_versions_pkey PRIMARY KEY (version); -- -- Name: format format_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.format ADD CONSTRAINT format_pkey PRIMARY KEY (id); -- -- Name: answer_content_unique; Type: INDEX; Schema: public; Owner: postgres -- CREATE UNIQUE INDEX answer_content_unique ON public.brandlift_answer_content USING btree (answer_id, brand_id); -- -- Name: answer_unique; Type: INDEX; Schema: public; Owner: postgres -- CREATE UNIQUE INDEX answer_unique ON public.brandlift_answer USING btree (question_id, respondent_id); -- -- Name: idx_1f1512ddd629f605; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_1f1512ddd629f605 ON public.campaign USING btree (format_id); -- -- Name: idx_3be90c3a44f5d008; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_3be90c3a44f5d008 ON public.brandlift_answer_content USING btree (brand_id); -- -- Name: idx_3be90c3aaa334807; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_3be90c3aaa334807 ON public.brandlift_answer_content USING btree (answer_id); -- -- Name: idx_80d627bdf639f774; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_80d627bdf639f774 ON public.brandlift_question USING btree (campaign_id); -- -- Name: idx_d5009950db296aad; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_d5009950db296aad ON public.brandlift_respondent USING btree (segment_id); -- -- Name: idx_d5009950f639f774; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_d5009950f639f774 ON public.brandlift_respondent USING btree (campaign_id); -- -- Name: idx_d671e368f639f774; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_d671e368f639f774 ON public.brandlift_brand USING btree (campaign_id); -- -- Name: idx_fcce59931e27f6bf; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_fcce59931e27f6bf ON public.brandlift_answer USING btree (question_id); -- -- Name: idx_fcce5993ce80cd19; Type: INDEX; Schema: public; Owner: postgres -- CREATE INDEX idx_fcce5993ce80cd19 ON public.brandlift_answer USING btree (respondent_id); -- -- Name: campaign fk_1f1512ddd629f605; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.campaign ADD CONSTRAINT fk_1f1512ddd629f605 FOREIGN KEY (format_id) REFERENCES public.format(id); -- -- Name: brandlift_answer_content fk_3be90c3a44f5d008; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_answer_content ADD CONSTRAINT fk_3be90c3a44f5d008 FOREIGN KEY (brand_id) REFERENCES public.brandlift_brand(id); -- -- Name: brandlift_answer_content fk_3be90c3aaa334807; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_answer_content ADD CONSTRAINT fk_3be90c3aaa334807 FOREIGN KEY (answer_id) REFERENCES public.brandlift_answer(id); -- -- Name: brandlift fk_5b5d1287f639f774; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift ADD CONSTRAINT fk_5b5d1287f639f774 FOREIGN KEY (campaign_id) REFERENCES public.campaign(id); -- -- Name: brandlift_question fk_80d627bdf639f774; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_question ADD CONSTRAINT fk_80d627bdf639f774 FOREIGN KEY (campaign_id) REFERENCES public.brandlift(campaign_id); -- -- Name: brandlift_respondent fk_d5009950db296aad; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_respondent ADD CONSTRAINT fk_d5009950db296aad FOREIGN KEY (segment_id) REFERENCES public.brandlift_segment(id); -- -- Name: brandlift_respondent fk_d5009950f639f774; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_respondent ADD CONSTRAINT fk_d5009950f639f774 FOREIGN KEY (campaign_id) REFERENCES public.brandlift(campaign_id); -- -- Name: brandlift_brand fk_d671e368f639f774; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_brand ADD CONSTRAINT fk_d671e368f639f774 FOREIGN KEY (campaign_id) REFERENCES public.brandlift(campaign_id); -- -- Name: brandlift_answer fk_fcce59931e27f6bf; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_answer ADD CONSTRAINT fk_fcce59931e27f6bf FOREIGN KEY (question_id) REFERENCES public.brandlift_question(id); -- -- Name: brandlift_answer fk_fcce5993ce80cd19; Type: FK CONSTRAINT; Schema: public; Owner: postgres -- ALTER TABLE ONLY public.brandlift_answer ADD CONSTRAINT fk_fcce5993ce80cd19 FOREIGN KEY (respondent_id) REFERENCES public.brandlift_respondent(id); -- -- PostgreSQL database dump complete --

所需的输出：
Campaign_id => 8d8c79ce-188c-4f5e-bd72-edb854faf34c
“旗舰品牌” => 耐克 (id=5)

brand_name	segment_name	count
Adidas	expo	0
Adidas	no expo	3
Lacoste	expo	1
Lacoste	no expo	3
Nike	expo	2
Nike	no expo	0
Puma	expo	1
Puma	no expo	2

更新：
最终在 brandlift_question 表中添加了一个“序数”列，以便以后如果我必须在 Brandlift 中添加更多问题，我可以根据其他问题索引比较答案，而不仅仅是在第一和第二之间

SELECT
    bb.name AS brand_name,
    s.name AS segment_name,
    COUNT(q2ac.brand_id)
FROM
    brandlift b
    LEFT JOIN brandlift_brand bb ON b.campaign_id = bb.campaign_id
    LEFT JOIN brandlift_respondent r ON b.campaign_id = r.campaign_id
    LEFT JOIN brandlift_segment s ON s.id = r.segment_id
    
    LEFT JOIN brandlift_question q1 ON b.campaign_id = q1.campaign_id AND q1.ordinal = 1
    LEFT JOIN brandlift_answer q1a ON r.id = q1a.respondent_id AND q1.id = q1a.question_id
    INNER JOIN brandlift_answer_content q1ac ON  q1a.id = q1ac.answer_id AND q1ac.brand_id = 5 -- the "flagship brand" id
    
    LEFT JOIN brandlift_question q2 ON q1.campaign_id = q2.campaign_id AND q2.ordinal = 2
    INNER JOIN brandlift_answer q2a ON q1a.respondent_id = q2a.respondent_id AND q2.id = q2a.question_id
    LEFT JOIN brandlift_answer_content q2ac ON q2a.id = q2ac.answer_id AND bb.id = q2ac.brand_id
WHERE
    b.campaign_id = '8d8c79ce-188c-4f5e-bd72-edb854faf34c'
GROUP BY
    bb.name,
    s.name

但还有一点，如果一个段上没有响应者，这个查询的结果输出将不会包含该段值填充为 0 的行。如果可能，也需要它们

我渴望任何建议

【问题讨论】：

标签： sql postgresql join count doctrine

【解决方案1】：

如果你不想做mod，那么你需要选择questionID。我使用 cross join 来获取其他一些没有响应的部分。并在 select 语句中，您 case 语句将 segmentName 计数为 0。

SELECT
    bb.name,
    s.name,
    CASE WHEN s.id IN(
        SELECT
            r.segment_id FROM brandlift_respondent r) THEN
        COUNT(q2ac.brand_id)
    ELSE
        0
    END AS CountNumber
FROM
    brandlift b
    LEFT JOIN brandlift_brand bb ON b.campaign_id = bb.campaign_id
    LEFT JOIN brandlift_respondent r ON b.campaign_id = r.campaign_id
    
    CROSS JOIN brandlift_segment s
    
    LEFT JOIN brandlift_question q1 ON b.campaign_id = q1.campaign_id AND q1.ordinal = 1
    LEFT JOIN brandlift_answer q1a ON r.id = q1a.respondent_id AND q1.id = q1a.question_id
    INNER JOIN brandlift_answer_content q1ac ON q1a.id = q1ac.answer_id AND q1ac.brand_id = 1 -- the "flagship brand" id
        
    LEFT JOIN brandlift_question q2 ON q1.campaign_id = q2.campaign_id AND q2.ordinal = 2
    LEFT JOIN brandlift_answer q2a ON q1a.respondent_id = q2a.respondent_id AND q2.id = q2a.question_id
    LEFT JOIN brandlift_answer_content q2ac ON q2a.id = q2ac.answer_id AND bb.id = q2ac.brand_id
WHERE
    b.campaign_id = :campaign_id -- parameter
    AND R.segment_id = s.id OR s.id NOT IN(SELECT r.segment_id FROM brandlift_respondent r)
GROUP BY
    bb.name,
    s.name,
    s.id

结果是这样的

【讨论】：

用另一个解决方案更新了问题，但仍需要建议/更正（如果段上没有受访者，则此查询的结果输出将不包含该段值填充为 0 的行，如果可能的话，我也需要它们）
所以你的意思是如果我们有segmentID = 7，名称例如'Other'，那么你想为每个人显示count() = 0？
是的，对于每个品牌，添加一个额外的行，segment_name "other" 并将值计数为 0
@Mohs 我已经更新了查询，这个查询非常适合我，让我知道它不适合你。谢谢
那你需要使用rank函数，你可以搜索一下