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create table person ( id bigint primary key , name varchar not null, age integer not null default 10, gender varchar default 'female' not null , address varchar ); alter table person add constraint ch_gender check ( gender in ('female','male') ); insert into person values (1, 'Anna', 16, 'female', 'Moscow'); insert into person values (2, 'Andrey', 21, 'male', 'Moscow'); insert into person values (3, 'Kate', 33, 'female', 'Kazan'); insert into person values (4, 'Denis', 13, 'male', 'Kazan'); insert into person values (5, 'Elvira', 45, 'female', 'Kazan'); insert into person values (6, 'Irina', 21, 'female', 'Saint-Petersburg'); insert into person values (7, 'Peter', 24, 'male', 'Saint-Petersburg'); insert into person values (8, 'Nataly', 30, 'female', 'Novosibirsk'); insert into person values (9, 'Dmitriy', 18, 'male', 'Samara'); create table pizzeria (id bigint primary key , name varchar not null , rating numeric not null default 0); alter table pizzeria add constraint ch_rating check ( rating between 0 and 5); insert into pizzeria values (1,'Pizza Hut', 4.6); insert into pizzeria values (2,'Dominos', 4.3); insert into pizzeria values (3,'DoDo Pizza', 3.2); insert into pizzeria values (4,'Papa Johns', 4.9); insert into pizzeria values (5,'Best Pizza', 2.3); insert into pizzeria values (6,'DinoPizza', 4.2); create table person_visits (id bigint primary key , person_id bigint not null , pizzeria_id bigint not null , visit_date date not null default current_date, constraint uk_person_visits unique (person_id, pizzeria_id, visit_date), constraint fk_person_visits_person_id foreign key (person_id) references person(id), constraint fk_person_visits_pizzeria_id foreign key (pizzeria_id) references pizzeria(id) ); insert into person_visits values (1, 1, 1, '2022-01-01'); insert into person_visits values (2, 2, 2, '2022-01-01'); insert into person_visits values (3, 2, 1, '2022-01-02'); insert into person_visits values (4, 3, 5, '2022-01-03'); insert into person_visits values (5, 3, 6, '2022-01-04'); insert into person_visits values (6, 4, 5, '2022-01-07'); insert into person_visits values (7, 4, 6, '2022-01-08'); insert into person_visits values (8, 5, 2, '2022-01-08'); insert into person_visits values (9, 5, 6, '2022-01-09'); insert into person_visits values (10, 6, 2, '2022-01-09'); insert into person_visits values (11, 6, 4, '2022-01-01'); insert into person_visits values (12, 7, 1, '2022-01-03'); insert into person_visits values (13, 7, 2, '2022-01-05'); insert into person_visits values (14, 8, 1, '2022-01-05'); insert into person_visits values (15, 8, 2, '2022-01-06'); insert into person_visits values (16, 8, 4, '2022-01-07'); insert into person_visits values (17, 9, 4, '2022-01-08'); insert into person_visits values (18, 9, 5, '2022-01-09'); insert into person_visits values (19, 9, 6, '2022-01-10'); create table menu (id bigint primary key , pizzeria_id bigint not null , pizza_name varchar not null , price numeric not null default 1, constraint fk_menu_pizzeria_id foreign key (pizzeria_id) references pizzeria(id)); insert into menu values (1,1,'cheese pizza', 900); insert into menu values (2,1,'pepperoni pizza', 1200); insert into menu values (3,1,'sausage pizza', 1200); insert into menu values (4,1,'supreme pizza', 1200); insert into menu values (5,6,'cheese pizza', 950); insert into menu values (6,6,'pepperoni pizza', 800); insert into menu values (7,6,'sausage pizza', 1000); insert into menu values (8,2,'cheese pizza', 800); insert into menu values (9,2,'mushroom pizza', 1100); insert into menu values (10,3,'cheese pizza', 780); insert into menu values (11,3,'supreme pizza', 850); insert into menu values (12,4,'cheese pizza', 700); insert into menu values (13,4,'mushroom pizza', 950); insert into menu values (14,4,'pepperoni pizza', 1000); insert into menu values (15,4,'sausage pizza', 950); insert into menu values (16,5,'cheese pizza', 700); insert into menu values (17,5,'pepperoni pizza', 800); insert into menu values (18,5,'supreme pizza', 850); create table person_order ( id bigint primary key , person_id bigint not null , menu_id bigint not null , order_date date not null default current_date, constraint fk_order_person_id foreign key (person_id) references person(id), constraint fk_order_menu_id foreign key (menu_id) references menu(id) ); insert into person_order values (1,1, 1, '2022-01-01'); insert into person_order values (2,1, 2, '2022-01-01'); insert into person_order values (3,2, 8, '2022-01-01'); insert into person_order values (4,2, 9, '2022-01-01'); insert into person_order values (5,3, 16, '2022-01-04'); insert into person_order values (6,4, 16, '2022-01-07'); insert into person_order values (7,4, 17, '2022-01-07'); insert into person_order values (8,4, 18, '2022-01-07'); insert into person_order values (9,4, 6, '2022-01-08'); insert into person_order values (10,4, 7, '2022-01-08'); insert into person_order values (11,5, 6, '2022-01-09'); insert into person_order values (12,5, 7, '2022-01-09'); insert into person_order values (13,6, 13, '2022-01-01'); insert into person_order values (14,7, 3, '2022-01-03'); insert into person_order values (15,7, 9, '2022-01-05'); insert into person_order values (16,7, 4, '2022-01-05'); insert into person_order values (17,8, 8, '2022-01-06'); insert into person_order values (18,8, 14, '2022-01-07'); insert into person_order values (19,9, 18, '2022-01-09'); insert into person_order values (20,9, 6, '2022-01-10'); CREATE VIEW v_persons_female AS SELECT * FROM person WHERE gender = 'female'; CREATE VIEW v_persons_male AS SELECT * FROM person WHERE gender = 'male'; CREATE VIEW v_generated_dates AS SELECT date::date AS generated_date FROM generate_series('2022-01-01'::date, '2022-01-31'::date, '1 day') AS date ORDER BY generated_date; CREATE VIEW v_symmetric_union AS (((SELECT person_visits.person_id FROM person_visits WHERE visit_date = '2022-01-02' EXCEPT SELECT person_visits.person_id FROM person_visits WHERE visit_date = '2022-01-06') UNION (SELECT person_visits.person_id FROM person_visits WHERE visit_date = '2022-01-06' EXCEPT SELECT person_visits.person_id FROM person_visits WHERE visit_date = '2022-01-02')) ORDER BY person_id) ; CREATE VIEW v_price_with_discount AS SELECT person.name AS name, menu.pizza_name AS pizza_name, menu.price AS price, CAST((menu.price - menu.price * 0.1) AS INT) AS discount_price FROM person_order JOIN person ON person.id = person_order.person_id JOIN menu ON person_order.menu_id = menu.id ORDER BY name, pizza_name; CREATE MATERIALIZED VIEW mv_dmitriy_visits_and_eats AS SELECT pizzeria.name AS pizzeria_name FROM pizzeria JOIN (SELECT person_visits.pizzeria_id FROM person JOIN person_visits ON person.id = person_visits.person_id WHERE person.name = 'Dmitriy' AND person_visits.visit_date = '2022-01-08') AS dmitriy ON dmitriy.pizzeria_id = pizzeria.id LEFT JOIN menu ON menu.pizzeria_id = pizzeria.id WHERE menu.price < 800; INSERT INTO person_visits (id, person_id, pizzeria_id, visit_date) VALUES ((SELECT MAX(id) FROM person_visits) + 1, 9, 3, '2022-01-08'); REFRESH MATERIALIZED VIEW mv_dmitriy_visits_and_eats; DROP VIEW v_generated_dates, v_persons_female, v_persons_male, v_price_with_discount, v_symmetric_union; DROP MATERIALIZED VIEW mv_dmitriy_visits_and_eats; select count(*) =0 as check from pg_class where relname in ('v_generated_dates','v_persons_female','v_persons_male', 'v_price_with_discount','v_symmetric_union', 'mv_dmitriy_visits_and_eats');