CS374-Database-Systems/Intermediate-SQL/hw3.sql

--
-- Name: Nicholas Tamassia
--
-- Write your queries below each comment. Please use good style (one clause
-- per line, JOIN syntax, indentation) and make sure all queries end with a
-- semicolon. When necessary, limit the output to the first 200 results.
--
-- DO NOT MODIFY OR DELETE ANY OTHER LINES!
--

-- -----------------------------------------------------------------------------
-- Connect to tpch database
\c tpch
-- -----------------------------------------------------------------------------

--
\echo
\echo Query #1
--
-- Show the customer name, order date, and line items for order number 3.
--
-- Schema: c_name, o_orderdate, l_partkey, l_suppkey, l_quantity, l_extendedPrice
--  Order: l_linenumber

SELECT c_name, o_orderdate, l_partkey, l_suppkey, l_quantity, l_extendedPrice
FROM customer
JOIN orders ON c_custkey = o_custkey
JOIN lineitem ON o_orderkey = l_orderkey
WHERE o_orderkey = 3
ORDER BY l_linenumber
LIMIT 200;

--
\echo
\echo Query #2
--
-- Show the part name, supply cost, and retail price of each line item.
--
-- Schema: l_orderkey, l_partkey, l_suppkey, p_name, ps_supplycost, p_retailprice
--  Order: l_orderkey, l_linenumber

SELECT l_orderkey, l_partkey, l_suppkey, p_name, ps_supplycost, p_retailprice
FROM lineitem
JOIN partsupp ON (l_partkey = ps_partkey AND l_suppkey = ps_suppkey)
JOIN part ON ps_partkey = p_partkey
ORDER BY l_orderkey, l_linenumber
LIMIT 200;

--
\echo
\echo Query #3
--
-- Which customers with an account balance over 5000 have no orders?
--
-- Schema: c_name, c_acctbal
--  Order: c_custkey

SELECT c_name, c_acctbal
FROM customer
LEFT JOIN orders ON c_custkey = o_custkey
WHERE c_acctbal > 5000 AND o_orderkey is NULL
ORDER BY c_custkey
LIMIT 200;

--
\echo
\echo Query #4
--
-- Which urgent priority orders have only one line item?
--
-- Schema: o_orderkey, o_custkey, o_orderstatus
--  Order: o_orderkey

SELECT o_orderkey, o_custkey, o_orderstatus
FROM orders
JOIN lineitem ON o_orderkey = l_orderkey
WHERE o_orderpriority = '1-URGENT'
GROUP BY o_orderkey
HAVING COUNT(l_orderkey) = 1
ORDER BY o_orderkey
LIMIT 200;

--
\echo
\echo Query #5
--
-- What parts containing the word "chocolate" were ordered on or after
-- August 1, 1998 and shipped by mail?
--
-- Schema: p_name, ps_supplycost, l_quantity
--  Order: p_partkey

SELECT p_name, ps_supplycost, l_quantity
FROM part
JOIN partsupp ON p_partkey = ps_partkey
JOIN lineitem ON (ps_partkey = l_partkey AND ps_suppkey = l_suppkey)
JOIN orders ON l_orderkey = o_orderkey
WHERE p_name LIKE '%chocolate%' AND o_orderdate >= '1998-08-01' AND l_shipmode = 'MAIL'
ORDER BY p_partkey
LIMIT 200;

--
\echo
\echo Query #6
--
-- Get the min, max, and average supply cost of each part. The average supply cost
-- must be rounded to 2 decimal places.
--
-- Schema: p_name, p_retailprice, min_supplycost, max_supplycost, avg_supplycost
--  Order: p_partkey

SELECT p_name, p_retailprice, MIN(ps_supplycost) AS "min_supplycost", MAX(ps_supplycost) AS "max_supplycost", ROUND(AVG(ps_supplycost), 2) as "avg_supplycost"
FROM part
JOIN partsupp on p_partkey = ps_partkey
GROUP BY p_partkey
ORDER BY p_partkey
LIMIT 200;


--
\echo
\echo Query #7
--
-- What suppliers have an inventory (total available quantity) of over 125,000
-- parts with size over 40.
--
-- Schema: r_name, n_name, s_name, total_qty
--  Order: r_name, n_name, s_name

SELECT r_name, n_name, s_name, SUM(ps_availqty) AS "total_qty"
FROM supplier
JOIN partsupp ON s_suppkey = ps_suppkey
JOIN part ON ps_partkey = p_partkey
JOIN nation ON s_nationkey = n_nationkey
JOIN region ON n_regionkey = r_regionkey
WHERE p_size > 40
GROUP BY s_name, n_name, r_name
HAVING SUM(ps_availqty) > 125000
ORDER BY r_name, n_name, s_name
LIMIT 200;

--
\echo
\echo Query #8
--
-- Find orders with a total profit of over $375,000. The profit of a single
-- lineitem is defined as quantity * (retail price - supply cost). The profit
-- of an order is the sum of its lineitem profits. For each order, show also
-- the number of lineitems, the total quantity of items (rounded to 0 decimal
-- places), and the total profit of the order (rounded to 2 decimal places).
--
-- Schema: l_orderkey, num_lineitems, total_quantity, total_profit
--  Order: total_profit (descending), total_quantity

SELECT l_orderkey, COUNT(l_quantity) AS "num_lineitems", ROUND(SUM(l_quantity)) AS "total_quantity", ROUND(SUM(l_quantity * (p_retailprice - ps_supplycost)), 2) AS "total_profit"
FROM orders
JOIN lineitem ON o_orderkey = l_orderkey
JOIN partsupp ON (l_partkey = ps_partkey AND l_suppkey = ps_suppkey)
JOIN part ON ps_partkey = p_partkey
GROUP BY l_orderkey
HAVING SUM(l_quantity * (p_retailprice - ps_supplycost)) > 375000
ORDER BY "total_profit" DESC, "total_quantity"
LIMIT 200;