i want to get lowest price values with id in mysql

Question

my query is

SELECT productscrapeddatalog.*, product.productname 
FROM productscrapeddatalog JOIN product
  ON productscrapeddatalog.productID = product.productID 
WHERE price = (SELECT MIN(price) FROM productscrapeddatalog ORDER BY productID)

this is my table screenshot

Answer 1

Your approach with a join and filtering in the where clause is ok - but you need to correlate the subquery with the outer query so you get the lowest price per product rathern thatn the overall min:

SELECT l.*, p.productname 
FROM productscrapeddatalog l
JOIN product p ON l.productID = l.productID 
WHERE l.price = (
    SELECT MIN(l1.price) 
    FROM productscrapeddatalog l1
    WHERE l1.productID = t.productID
)

If you are running MySQL 8.0, you can also do this with window functions:

SELECT l.*, p.productname 
FROM product p
JOIN (
    SELECT l.*, RANK() OVER(PARTITION BY productID ORDER BY price) rn 
    FROM productscrapeddatalog l
) p ON l.productID = l.productID AND l.rn = 1

Answer 2

You should try this:

SELECT productscrapeddatalog.*, product.productname, MIN(productscrapeddatalog.price) 
FROM productscrapeddatalog JOIN product
  ON productscrapeddatalog.productID = product.productID 
ORDER BY productID