Using Orderby before GroupBy in Laravel - php

Question

I have a table that I want to select product_name with lowest/min price the following:
product_name | price
Cat | 12
Dog | 21
Cat | 14
Dog | 20
Fish | 10
Fish | 3
THE DESIRE Output should be
Cat | 12
Dog | 20
Fish | 3
BELOW IS MY SQL QUERY
$products = DB::table('products')
->orderBy('products.products_price', 'asc')
->groupBy('products.products_name')
->get();
When I used this script, it only shows the highest/max price, not the lowest price

Answer 1

You need an aggregate instead of ordering. For Laravel, that means passing in the columns along with a DB::raw:
$products = DB::table('products')
->orderBy('products.products_price', 'asc')
->groupBy('products.products_name')
->select(['product_name', DB::raw('min(price) as price')])
->get();
Edit for ID
Taking off the answer here : SQL: Group by minimum value in one field while selecting distinct rows the mysql query would be
SELECT p1.*
FROM products p1 INNER JOIN
(
SELECT product_name, MIN(price) AS as min_price
FROM products
GROUP BY product_name
) p2 ON p1.product_name = p2.product_name AND p1.price = p2.min_price
Now we have to convert it to Query Builder
$products = DB::table('products AS p1')
->join(DB::raw('(
SELECT product_name, MIN(price) AS as min_price
FROM products
GROUP BY product_name
) AS p2'),
function($join)
{
$join->on('p1.product_name', '=', 'p2.product_name');
$join->on('p1.price', '=', 'p2.min_price');
})
->get(['p1.id', 'p1.product_name', 'p1.price']);
This has not been tested, so I hope it works

Answer 2

Problem:
You are not defining that the price attribute should be aggregated to a minimum.
Solution:
If you want the max price you need to select the MIN() aggregation.
You can do this by using ->selectRaw('MIN(price) as max_price').
Please Note:
If you want other attributes also selected simply add them comma separated.
->selectRaw('name, MAX(price) as max_price')
#edit
Do you still use the oderBy? If not, try it with orderBy('products.products_price', 'ASC')