FIXED

aharlamcev/postgresql/SQL2.0FULL.sql

@@ -23,6 +23,7 @@ id INT primary key,
 user_id INT,
 order_date DATE not null,
 status VARCHAR(20)
+FOREIGN KEY (user_id) REFERENCES users(id)
 );
 
 create table order_items (
@@ -31,6 +32,7 @@ product_id INT,
 quantity INT not null,
 price_at_purchase DECIMAL(10, 2) not null,
 primary key (order_id, product_id)
+FOREIGN KEY ()
 );
 
 alter table users
@@ -276,7 +278,7 @@ order by domain, name;
 
 -- 3 задание
 select name, age,
-case when age < 25 then 'young'
+case when age < 20 then 'young'
 	 when age between 20 and 30 then 'adult'
 	 else 'senior'
 	 end as age_group