Schema:
CREATE TABLE "manufacturer" (
    "Manufacturer_ID" int,
    "Open_Year" real,
    "Name" text,
    "Num_of_Factories" int,
    "Num_of_Shops" int,
    PRIMARY KEY ("Manufacturer_ID")
);
CREATE TABLE "furniture" (
    "Furniture_ID" int,
    "Name" text,
    "Num_of_Component" int,
    "Market_Rate" real,
    PRIMARY KEY ("Furniture_ID")
);
CREATE TABLE "furniture_manufacte" (
    "Manufacturer_ID" int,
    "Furniture_ID" int,
    "Price_in_Dollar" real,
    PRIMARY KEY ("Manufacturer_ID","Furniture_ID"),
    FOREIGN KEY ("Manufacturer_ID") REFERENCES `manufacturer`("Manufacturer_ID"),
    FOREIGN KEY ("Furniture_ID") REFERENCES `furniture`("Furniture_ID")
);

Question: How many furniture components are there in total?
SQL:
SELECT sum(num_of_component) FROM furniture

Question: Return the name and id of the furniture with the highest market rate.
SQL:
SELECT name ,  furniture_id FROM furniture ORDER BY market_rate DESC LIMIT 1

Question: find the total market rate of the furnitures that have the top 2 market shares.
SQL:
SELECT sum(market_rate) FROM furniture ORDER BY market_rate DESC LIMIT 2

Question: Find the component amounts and names of all furnitures that have more than 10 components.
SQL:
SELECT Num_of_Component ,  name FROM furniture WHERE Num_of_Component  >  10

Question: Find the name and component amount of the least popular furniture.
SQL:
SELECT name ,  Num_of_Component FROM furniture ORDER BY market_rate LIMIT 1

Question: Find the names of furnitures whose prices are lower than the highest price.
SQL:
SELECT t1.name FROM furniture AS t1 JOIN furniture_manufacte AS t2 ON t1.Furniture_ID  =  t2.Furniture_ID WHERE t2.Price_in_Dollar  <  (SELECT max(Price_in_Dollar) FROM furniture_manufacte)

Question: Which manufacturer has the most number of shops? List its name and year of opening.
SQL:
SELECT open_year ,  name FROM manufacturer ORDER BY num_of_shops DESC LIMIT 1

Question: Find the average number of factories for the manufacturers that have more than 20 shops.
SQL:
SELECT avg(Num_of_Factories) FROM manufacturer WHERE num_of_shops  >  20

Question: List all manufacturer names and ids ordered by their opening year.
SQL:
SELECT name ,  manufacturer_id FROM manufacturer ORDER BY open_year

Question: Give me the name and year of opening of the manufacturers that have either less than 10 factories or more than 10 shops.
SQL:
SELECT name ,  open_year FROM manufacturer WHERE num_of_shops  >  10 OR Num_of_Factories  <  10

Question: what is the average number of factories and maximum number of shops for manufacturers that opened before 1990.
SQL:
SELECT max(num_of_shops) ,  avg(Num_of_Factories) FROM manufacturer WHERE open_year  <  1990

Question: Find the id and number of shops for the company that produces the most expensive furniture.
SQL:
SELECT t1.manufacturer_id ,  t1.num_of_shops FROM manufacturer AS t1 JOIN furniture_manufacte AS t2 ON t1.manufacturer_id  =  t2.manufacturer_id ORDER BY t2.Price_in_Dollar DESC LIMIT 1

Question: Find the number of funiture types produced by each manufacturer as well as the company names.
SQL:
SELECT count(*) ,  t1.name FROM manufacturer AS t1 JOIN furniture_manufacte AS t2 ON t1.manufacturer_id  =  t2.manufacturer_id GROUP BY t1.manufacturer_id

Question: Give me the names and prices of furnitures which some companies are manufacturing.
SQL:
SELECT t1.name ,  t2.price_in_dollar FROM furniture AS t1 JOIN furniture_manufacte AS t2 ON t1.Furniture_ID  =  t2.Furniture_ID

Question: Find the market shares and names of furnitures which no any company is producing in our records.
SQL:
SELECT Market_Rate ,  name FROM furniture WHERE Furniture_ID NOT IN (SELECT Furniture_ID FROM furniture_manufacte)

Question: Find the name of the company that produces both furnitures with less than 6 components and furnitures with more than 10 components.
SQL:
SELECT t3.name FROM furniture AS t1 JOIN furniture_manufacte AS t2 ON t1.Furniture_ID  =  t2.Furniture_ID JOIN manufacturer AS t3 ON t2.manufacturer_id  =  t3.manufacturer_id WHERE t1.num_of_component  <  6 INTERSECT SELECT t3.name FROM furniture AS t1 JOIN furniture_manufacte AS t2 ON t1.Furniture_ID  =  t2.Furniture_ID JOIN manufacturer AS t3 ON t2.manufacturer_id  =  t3.manufacturer_id WHERE t1.num_of_component  >  10