One of the SQL questions recently asked in TCS interview.
Given us products and transactions table, We need to Find product wise total amount, including products with no sales.

Let us create table and insert data
create table products (pid int, pname varchar(50), price int)
insert into products values (1, 'A', 1000),(2, 'B', 400),(3, 'C', 500);

create table transcations (pid int, sold_date DATE, qty int, amount int)
insert into transcations values (1, '20240201', 2, 2000),(1, '20240301', 4, 4000),
(1, '20240315', 2, 2000),(3, '20240424', 3, 1500),(3, '20240516', 5, 2500);


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