仅在1行上使用SUM gworking的SQL查询

Question

I am currently learning the basics of SQL. I have tried this query but the result happened to work for only one of the rows (FireBow). How do I fix this?

CREATE TABLE store (id_prod INTEGER PRIMARY KEY AUTOINCREMENT, prod TEXT, price REAL, q REAL);
INSERT INTO store (prod, price, q) VALUES ("DragonSword", 1500.0, 4.0);
INSERT INTO store (prod, price, q) VALUES ("MagicOrb", 950.0, 7.0);
INSERT INTO store (prod, price, q) VALUES ("FireBow", 500.0, 5.0);
UPDATE store SET q=q-3 WHERE prod="FireBow";

SELECT prod, price, q, ((price*q)/SUM(price*q)) AS prec_worth 
FROM store;

Answer 1

If you are not using group by statement then it will show only one record. Instead of using SUM directly in query. Use below one with sub query .

SELECT prod, price, q, ((price*q)/(select sum(price*q) from store s)) AS prec_worth
FROM store t;