CREATE TABLE market (Market_ID INT, District TEXT, Num_of_employees INT, Num_of_shops FLOAT, Ranking INT)
CREATE TABLE phone (Name TEXT, Phone_ID INT, Memory_in_G INT, Carrier TEXT, Price FLOAT)
CREATE TABLE phone_market (Market_ID INT, Phone_ID TEXT, Num_of_stock INT)

Bar chart x axis carrier y axis the number of carrier, show by the X in asc.
SELECT Carrier, COUNT(Carrier) FROM phone GROUP BY Carrier ORDER BY Carrier
SELECT "Carrier", COUNT("Carrier") FROM "phone" GROUP BY "Carrier" ORDER BY "Carrier" NULLS FIRST