-- http://www.tpc.org/tpc_documents_current_versions/pdf/tpc-h_v2.17.1.pdf
CREATE DATABASE IF NOT EXISTS TPCH;
USE TPCH;
CREATE TABLE IF NOT EXISTS nation  ( N_NATIONKEY  INTEGER NOT NULL,
                            N_NAME       CHAR(25) NOT NULL,
                            N_REGIONKEY  INTEGER NOT NULL,
                            N_COMMENT    VARCHAR(152),
			    PRIMARY KEY (N_NATIONKEY));

CREATE TABLE IF NOT EXISTS region  ( R_REGIONKEY  INTEGER NOT NULL,
       	               R_NAME       CHAR(25) NOT NULL,
                       R_COMMENT    VARCHAR(152),
	               PRIMARY KEY (R_REGIONKEY));

CREATE TABLE IF NOT EXISTS part  ( P_PARTKEY     INTEGER NOT NULL,
                          P_NAME        VARCHAR(55) NOT NULL,
                          P_MFGR        CHAR(25) NOT NULL,
                          P_BRAND       CHAR(10) NOT NULL,
                          P_TYPE        VARCHAR(25) NOT NULL,
                          P_SIZE        INTEGER NOT NULL,
                          P_CONTAINER   CHAR(10) NOT NULL,
                          P_RETAILPRICE DECIMAL(15,2) NOT NULL,
                          P_COMMENT     VARCHAR(23) NOT NULL,
			  PRIMARY KEY (P_PARTKEY));

CREATE TABLE IF NOT EXISTS supplier  ( S_SUPPKEY     INTEGER NOT NULL,
                             S_NAME        CHAR(25) NOT NULL,
                             S_ADDRESS     VARCHAR(40) NOT NULL,
                             S_NATIONKEY   INTEGER NOT NULL,
                             S_PHONE       CHAR(15) NOT NULL,
                             S_ACCTBAL     DECIMAL(15,2) NOT NULL,
                             S_COMMENT     VARCHAR(101) NOT NULL,
			     PRIMARY KEY (S_SUPPKEY),
			     CONSTRAINT FOREIGN KEY SUPPLIER_FK1 (S_NATIONKEY) references nation(N_NATIONKEY));

CREATE TABLE IF NOT EXISTS partsupp ( PS_PARTKEY     INTEGER NOT NULL,
                             PS_SUPPKEY     INTEGER NOT NULL,
                             PS_AVAILQTY    INTEGER NOT NULL,
                             PS_SUPPLYCOST  DECIMAL(15,2)  NOT NULL,
                             PS_COMMENT     VARCHAR(199) NOT NULL,
			     PRIMARY KEY (PS_PARTKEY,PS_SUPPKEY),
			     CONSTRAINT FOREIGN KEY PARTSUPP_FK1 (PS_SUPPKEY) references supplier(S_SUPPKEY),
			     CONSTRAINT FOREIGN KEY PARTSUPP_FK2 (PS_PARTKEY) references part(P_PARTKEY));

CREATE TABLE IF NOT EXISTS customer  ( C_CUSTKEY     INTEGER NOT NULL,
                             C_NAME        VARCHAR(25) NOT NULL,
                             C_ADDRESS     VARCHAR(40) NOT NULL,
                             C_NATIONKEY   INTEGER NOT NULL,
                             C_PHONE       CHAR(15) NOT NULL,
                             C_ACCTBAL     DECIMAL(15,2)   NOT NULL,
                             C_MKTSEGMENT  CHAR(10) NOT NULL,
                             C_COMMENT     VARCHAR(117) NOT NULL,
			     PRIMARY KEY (C_CUSTKEY),
			     CONSTRAINT FOREIGN KEY CUSTOMER_FK1 (C_NATIONKEY) references nation(N_NATIONKEY));

CREATE TABLE IF NOT EXISTS orders  ( O_ORDERKEY       INTEGER NOT NULL,
                           O_CUSTKEY        INTEGER NOT NULL,
                           O_ORDERSTATUS    CHAR(1) NOT NULL,
                           O_TOTALPRICE     DECIMAL(15,2) NOT NULL,
                           O_ORDERDATE      DATE NOT NULL,
                           O_ORDERPRIORITY  CHAR(15) NOT NULL,  
                           O_CLERK          CHAR(15) NOT NULL, 
                           O_SHIPPRIORITY   INTEGER NOT NULL,
                           O_COMMENT        VARCHAR(79) NOT NULL,
			   PRIMARY KEY (O_ORDERKEY),
			   CONSTRAINT FOREIGN KEY ORDERS_FK1 (O_CUSTKEY) references customer(C_CUSTKEY));

CREATE TABLE IF NOT EXISTS lineitem ( L_ORDERKEY    INTEGER NOT NULL,
                             L_PARTKEY     INTEGER NOT NULL,
                             L_SUPPKEY     INTEGER NOT NULL,
                             L_LINENUMBER  INTEGER NOT NULL,
                             L_QUANTITY    DECIMAL(15,2) NOT NULL,
                             L_EXTENDEDPRICE  DECIMAL(15,2) NOT NULL,
                             L_DISCOUNT    DECIMAL(15,2) NOT NULL,
                             L_TAX         DECIMAL(15,2) NOT NULL,
                             L_RETURNFLAG  CHAR(1) NOT NULL,
                             L_LINESTATUS  CHAR(1) NOT NULL,
                             L_SHIPDATE    DATE NOT NULL,
                             L_COMMITDATE  DATE NOT NULL,
                             L_RECEIPTDATE DATE NOT NULL,
                             L_SHIPINSTRUCT CHAR(25) NOT NULL,
                             L_SHIPMODE     CHAR(10) NOT NULL,
                             L_COMMENT      VARCHAR(44) NOT NULL,
			     PRIMARY KEY (L_ORDERKEY,L_LINENUMBER),
			     CONSTRAINT FOREIGN KEY LINEITEM_FK1 (L_ORDERKEY)  references orders(O_ORDERKEY),
			     CONSTRAINT FOREIGN KEY LINEITEM_FK2 (L_PARTKEY,L_SUPPKEY) references partsupp(PS_PARTKEY, PS_SUPPKEY));
-- load stats.
load stats 's/tpch_stats/nation.json';
load stats 's/tpch_stats/region.json';
load stats 's/tpch_stats/part.json';
load stats 's/tpch_stats/supplier.json';
load stats 's/tpch_stats/partsupp.json';
load stats 's/tpch_stats/customer.json';
load stats 's/tpch_stats/orders.json';
load stats 's/tpch_stats/lineitem.json';

set @@session.tidb_opt_agg_push_down = 0;

/*
    Q1 Pricing Summary Report
    This query reports the amount of business that was billed, shipped, and returned.

    The Pricing Summary Report Query provides a summary pricing report for all lineitems shipped as of a given date.
    The date is within 60 - 120 days of the greatest ship date contained in the database. The query lists totals for
    extended price, discounted extended price, discounted extended price plus tax, average quantity, average extended
    price, and average discount. These aggregates are grouped by RETURNFLAG and LINESTATUS, and listed in
    ascending order of RETURNFLAG and LINESTATUS. A count of the number of lineitems in each group is
    included.

    Planner enhancement: none.
*/
explain
select
	l_returnflag,
	l_linestatus,
	sum(l_quantity) as sum_qty,
	sum(l_extendedprice) as sum_base_price,
	sum(l_extendedprice * (1 - l_discount)) as sum_disc_price,
	sum(l_extendedprice * (1 - l_discount) * (1 + l_tax)) as sum_charge,
	avg(l_quantity) as avg_qty,
	avg(l_extendedprice) as avg_price,
	avg(l_discount) as avg_disc,
	count(*) as count_order
from
	lineitem
where
	l_shipdate <= date_sub('1998-12-01', interval 108 day)
group by
	l_returnflag,
	l_linestatus
order by
	l_returnflag,
	l_linestatus;

/*
    Q2 Minimum Cost Supplier Query
    This query finds which supplier should be selected to place an order for a given part in a given region.

    The Minimum Cost Supplier Query finds, in a given region, for each part of a certain type and size, the supplier who
    can supply it at minimum cost. If several suppliers in that region offer the desired part type and size at the same
    (minimum) cost, the query lists the parts from suppliers with the 100 highest account balances. For each supplier,
    the query lists the supplier's account balance, name and nation; the part's number and manufacturer; the supplier's
    address, phone number and comment information.

    Planner enhancement: join reorder.
*/
explain
select
	s_acctbal,
	s_name,
	n_name,
	p_partkey,
	p_mfgr,
	s_address,
	s_phone,
	s_comment
from
	part,
	supplier,
	partsupp,
	nation,
	region
where
	p_partkey = ps_partkey
	and s_suppkey = ps_suppkey
	and p_size = 30
	and p_type like '%STEEL'
	and s_nationkey = n_nationkey
	and n_regionkey = r_regionkey
	and r_name = 'ASIA'
	and ps_supplycost = (
		select
			min(ps_supplycost)
		from
			partsupp,
			supplier,
			nation,
			region
		where
			p_partkey = ps_partkey
			and s_suppkey = ps_suppkey
			and s_nationkey = n_nationkey
			and n_regionkey = r_regionkey
			and r_name = 'ASIA'
	)
order by
	s_acctbal desc,
	n_name,
	s_name,
	p_partkey
limit 100;

/*
    Q3 Shipping Priority Query
    This query retrieves the 10 unshipped orders with the highest value.

    The Shipping Priority Query retrieves the shipping priority and potential revenue, defined as the sum of
    l_extendedprice * (1-l_discount), of the orders having the largest revenue among those that had not been shipped as
    of a given date. Orders are listed in decreasing order of revenue. If more than 10 unshipped orders exist, only the 10
    orders with the largest revenue are listed.

    planner enhancement: if group-by item have primary key, non-priamry key is useless.
*/
explain
select
	l_orderkey,
	sum(l_extendedprice * (1 - l_discount)) as revenue,
	o_orderdate,
	o_shippriority
from
	customer,
	orders,
	lineitem
where
	c_mktsegment = 'AUTOMOBILE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < '1995-03-13'
	and l_shipdate > '1995-03-13'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
limit 10;

/*
    Q4 Order Priority Checking Query
    This query determines how well the order priority system is working and gives an assessment of customer satisfaction.

    The Order Priority Checking Query counts the number of orders ordered in a given quarter of a given year in which
    at least one lineitem was received by the customer later than its committed date. The query lists the count of such
    orders for each order priority sorted in ascending priority order.
*/
explain
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= '1995-01-01'
	and o_orderdate < date_add('1995-01-01', interval '3' month)
	and exists (
		select
			*
		from
			lineitem
		where
			l_orderkey = o_orderkey
			and l_commitdate < l_receiptdate
	)
group by
	o_orderpriority
order by
	o_orderpriority;

/*
    Q5 Local Supplier Volume Query
    This query lists the revenue volume done through local suppliers.

    The Local Supplier Volume Query lists for each nation in a region the revenue volume that resulted from lineitem
    transactions in which the customer ordering parts and the supplier filling them were both within that nation. The
    query is run in order to determine whether to institute local distribution centers in a given region. The query considers
    only parts ordered in a given year. The query displays the nations and revenue volume in descending order by
    revenue. Revenue volume for all qualifying lineitems in a particular nation is defined as sum(l_extendedprice * (1 -
    l_discount)).

    Planner enhancement: join reorder.
*/
explain
select
	n_name,
	sum(l_extendedprice * (1 - l_discount)) as revenue
from
	customer,
	orders,
	lineitem,
	supplier,
	nation,
	region
where
	c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and l_suppkey = s_suppkey
	and c_nationkey = s_nationkey
	and s_nationkey = n_nationkey
	and n_regionkey = r_regionkey
	and r_name = 'MIDDLE EAST'
	and o_orderdate >= '1994-01-01'
	and o_orderdate < date_add('1994-01-01', interval '1' year)
group by
	n_name
order by
	revenue desc;

/*
    Q6 Forecasting Revenue Change Query
    This query quantifies the amount of revenue increase that would have resulted from eliminating certain companywide
    discounts in a given percentage range in a given year. Asking this type of "what if" query can be used to look
    for ways to increase revenues.

    The Forecasting Revenue Change Query considers all the lineitems shipped in a given year with discounts between
    DISCOUNT-0.01 and DISCOUNT+0.01. The query lists the amount by which the total revenue would have
    increased if these discounts had been eliminated for lineitems with l_quantity less than quantity. Note that the
    potential revenue increase is equal to the sum of [l_extendedprice * l_discount] for all lineitems with discounts and
    quantities in the qualifying range.
*/
explain
select
	sum(l_extendedprice * l_discount) as revenue
from
	lineitem
where
	l_shipdate >= '1994-01-01'
	and l_shipdate < date_add('1994-01-01', interval '1' year)
	and l_discount between 0.06 - 0.01 and 0.06 + 0.01
	and l_quantity < 24;

/*
    Q7 Volume Shipping Query
    This query determines the value of goods shipped between certain nations to help in the re-negotiation of shipping
    contracts.

    The Volume Shipping Query finds, for two given nations, the gross discounted revenues derived from lineitems in
    which parts were shipped from a supplier in either nation to a customer in the other nation during 1995 and 1996.
    The query lists the supplier nation, the customer nation, the year, and the revenue from shipments that took place in
    that year. The query orders the answer by Supplier nation, Customer nation, and year (all ascending).

    Planner enahancement: join reorder.
*/
explain
select
	supp_nation,
	cust_nation,
	l_year,
	sum(volume) as revenue
from
	(
		select
			n1.n_name as supp_nation,
			n2.n_name as cust_nation,
			extract(year from l_shipdate) as l_year,
			l_extendedprice * (1 - l_discount) as volume
		from
			supplier,
			lineitem,
			orders,
			customer,
			nation n1,
			nation n2
		where
			s_suppkey = l_suppkey
			and o_orderkey = l_orderkey
			and c_custkey = o_custkey
			and s_nationkey = n1.n_nationkey
			and c_nationkey = n2.n_nationkey
			and (
				(n1.n_name = 'JAPAN' and n2.n_name = 'INDIA')
				or (n1.n_name = 'INDIA' and n2.n_name = 'JAPAN')
			)
			and l_shipdate between '1995-01-01' and '1996-12-31'
	) as shipping
group by
	supp_nation,
	cust_nation,
	l_year
order by
	supp_nation,
	cust_nation,
	l_year;

/*
    Q8 National Market Share Query
    This query determines how the market share of a given nation within a given region has changed over two years for
    a given part type.

    The market share for a given nation within a given region is defined as the fraction of the revenue, the sum of
    [l_extendedprice * (1-l_discount)], from the products of a specified type in that region that was supplied by suppliers
    from the given nation. The query determines this for the years 1995 and 1996 presented in this order.

    Planner enhancement: join reorder.
*/
explain
select
	o_year,
	sum(case
		when nation = 'INDIA' then volume
		else 0
	end) / sum(volume) as mkt_share
from
	(
		select
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) as volume,
			n2.n_name as nation
		from
			part,
			supplier,
			lineitem,
			orders,
			customer,
			nation n1,
			nation n2,
			region
		where
			p_partkey = l_partkey
			and s_suppkey = l_suppkey
			and l_orderkey = o_orderkey
			and o_custkey = c_custkey
			and c_nationkey = n1.n_nationkey
			and n1.n_regionkey = r_regionkey
			and r_name = 'ASIA'
			and s_nationkey = n2.n_nationkey
			and o_orderdate between '1995-01-01' and '1996-12-31'
			and p_type = 'SMALL PLATED COPPER'
	) as all_nations
group by
	o_year
order by
	o_year;

/*
    Q9 Product Type Profit Measure Query
    This query determines how much profit is made on a given line of parts, broken out by supplier nation and year.

    The Product Type Profit Measure Query finds, for each nation and each year, the profit for all parts ordered in that
    year that contain a specified substring in their names and that were filled by a supplier in that nation. The profit is
    defined as the sum of [(l_extendedprice*(1-l_discount)) - (ps_supplycost * l_quantity)] for all lineitems describing
    parts in the specified line. The query lists the nations in ascending alphabetical order and, for each nation, the year
    and profit in descending order by year (most recent first).

    Planner enhancement: join reorder.
*/
explain
select
	nation,
	o_year,
	sum(amount) as sum_profit
from
	(
		select
			n_name as nation,
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) - ps_supplycost * l_quantity as amount
		from
			part,
			supplier,
			lineitem,
			partsupp,
			orders,
			nation
		where
			s_suppkey = l_suppkey
			and ps_suppkey = l_suppkey
			and ps_partkey = l_partkey
			and p_partkey = l_partkey
			and o_orderkey = l_orderkey
			and s_nationkey = n_nationkey
			and p_name like '%dim%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;

/*
    Q10 Returned Item Reporting Query
    The query identifies customers who might be having problems with the parts that are shipped to them.

    The Returned Item Reporting Query finds the top 20 customers, in terms of their effect on lost revenue for a given
    quarter, who have returned parts. The query considers only parts that were ordered in the specified quarter. The
    query lists the customer's name, address, nation, phone number, account balance, comment information and revenue
    lost. The customers are listed in descending order of lost revenue. Revenue lost is defined as
    sum(l_extendedprice*(1-l_discount)) for all qualifying lineitems.

    Planner enhancement: join reorder, if group-by item have primary key, non-priamry key is useless.
*/
explain
select
	c_custkey,
	c_name,
	sum(l_extendedprice * (1 - l_discount)) as revenue,
	c_acctbal,
	n_name,
	c_address,
	c_phone,
	c_comment
from
	customer,
	orders,
	lineitem,
	nation
where
	c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate >= '1993-08-01'
	and o_orderdate < date_add('1993-08-01', interval '3' month)
	and l_returnflag = 'R'
	and c_nationkey = n_nationkey
group by
	c_custkey,
	c_name,
	c_acctbal,
	c_phone,
	n_name,
	c_address,
	c_comment
order by
	revenue desc
limit 20;

/*
    Q11 Important Stock Identification Query
    This query finds the most important subset of suppliers' stock in a given nation.

    The Important Stock Identification Query finds, from scanning the available stock of suppliers in a given nation, all
    the parts that represent a significant percentage of the total value of all available parts. The query displays the part
    number and the value of those parts in descending order of value.
*/
explain
select
	ps_partkey,
	sum(ps_supplycost * ps_availqty) as value
from
	partsupp,
	supplier,
	nation
where
	ps_suppkey = s_suppkey
	and s_nationkey = n_nationkey
	and n_name = 'MOZAMBIQUE'
group by
	ps_partkey having
		sum(ps_supplycost * ps_availqty) > (
			select
				sum(ps_supplycost * ps_availqty) * 0.0001000000
			from
				partsupp,
				supplier,
				nation
			where
				ps_suppkey = s_suppkey
				and s_nationkey = n_nationkey
				and n_name = 'MOZAMBIQUE'
		)
order by
	value desc;

/*
    Q12 Shipping Modes and Order Priority Query
    This query determines whether selecting less expensive modes of shipping is negatively affecting the critical-priority
    orders by causing more parts to be received by customers after the committed date.

    The Shipping Modes and Order Priority Query counts, by ship mode, for lineitems actually received by customers in
    a given year, the number of lineitems belonging to orders for which the l_receiptdate exceeds the l_commitdate for
    two different specified ship modes. Only lineitems that were actually shipped before the l_commitdate are considered.
    The late lineitems are partitioned into two groups, those with priority URGENT or HIGH, and those with a
    priority other than URGENT or HIGH.
*/
explain
select
	l_shipmode,
	sum(case
		when o_orderpriority = '1-URGENT'
			or o_orderpriority = '2-HIGH'
			then 1
		else 0
	end) as high_line_count,
	sum(case
		when o_orderpriority <> '1-URGENT'
			and o_orderpriority <> '2-HIGH'
			then 1
		else 0
	end) as low_line_count
from
	orders,
	lineitem
where
	o_orderkey = l_orderkey
	and l_shipmode in ('RAIL', 'FOB')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= '1997-01-01'
	and l_receiptdate < date_add('1997-01-01', interval '1' year)
group by
	l_shipmode
order by
	l_shipmode;

/*
    Q13 Customer Distribution Query
    This query seeks relationships between customers and the size of their orders.

    This query determines the distribution of customers by the number of orders they have made, including customers
    who have no record of orders, past or present. It counts and reports how many customers have no orders, how many
    have 1, 2, 3, etc. A check is made to ensure that the orders counted do not fall into one of several special categories
    of orders. Special categories are identified in the order comment column by looking for a particular pattern.
*/
explain
select
	c_count,
	count(*) as custdist
from
	(
		select
			c_custkey,
			count(o_orderkey) as c_count
		from
			customer left outer join orders on
				c_custkey = o_custkey
				and o_comment not like '%pending%deposits%'
		group by
			c_custkey
	) c_orders
group by
	c_count
order by
	custdist desc,
	c_count desc;

/*
    Q14 Promotion Effect Query
    This query monitors the market response to a promotion such as TV advertisements or a special campaign.

    The Promotion Effect Query determines what percentage of the revenue in a given year and month was derived from
    promotional parts. The query considers only parts actually shipped in that month and gives the percentage. Revenue
    is defined as (l_extendedprice * (1-l_discount)).
*/
explain
select
	100.00 * sum(case
		when p_type like 'PROMO%'
			then l_extendedprice * (1 - l_discount)
		else 0
	end) / sum(l_extendedprice * (1 - l_discount)) as promo_revenue
from
	lineitem,
	part
where
	l_partkey = p_partkey
	and l_shipdate >= '1996-12-01'
	and l_shipdate < date_add('1996-12-01', interval '1' month);

/*
    Q15 Top Supplier Query
    This query determines the top supplier so it can be rewarded, given more business, or identified for special recognition.

    The Top Supplier Query finds the supplier who contributed the most to the overall revenue for parts shipped during
    a given quarter of a given year. In case of a tie, the query lists all suppliers whose contribution was equal to the
    maximum, presented in supplier number order.

    Planner enhancement: support view.

create view revenue0 (supplier_no, total_revenue) as
	select
		l_suppkey,
		sum(l_extendedprice * (1 - l_discount))
	from
		lineitem
	where
		l_shipdate >= '1997-07-01'
		and l_shipdate < date_add('1997-07-01', interval '3' month)
	group by
		l_suppkey


select
	s_suppkey,
	s_name,
	s_address,
	s_phone,
	total_revenue
from
	supplier,
	revenue0
where
	s_suppkey = supplier_no
	and total_revenue = (
		select
			max(total_revenue)
		from
			revenue0
	)
order by
	s_suppkey

drop view revenue0
*/

/*
    Q16 Parts/Supplier Relationship Query
    This query finds out how many suppliers can supply parts with given attributes. It might be used, for example, to
    determine whether there is a sufficient number of suppliers for heavily ordered parts.

    The Parts/Supplier Relationship Query counts the number of suppliers who can supply parts that satisfy a particular
    customer's requirements. The customer is interested in parts of eight different sizes as long as they are not of a given
    type, not of a given brand, and not from a supplier who has had complaints registered at the Better Business Bureau.
    Results must be presented in descending count and ascending brand, type, and size.
*/
explain
select
	p_brand,
	p_type,
	p_size,
	count(distinct ps_suppkey) as supplier_cnt
from
	partsupp,
	part
where
	p_partkey = ps_partkey
	and p_brand <> 'Brand#34'
	and p_type not like 'LARGE BRUSHED%'
	and p_size in (48, 19, 12, 4, 41, 7, 21, 39)
	and ps_suppkey not in (
		select
			s_suppkey
		from
			supplier
		where
			s_comment like '%Customer%Complaints%'
	)
group by
	p_brand,
	p_type,
	p_size
order by
	supplier_cnt desc,
	p_brand,
	p_type,
	p_size;

/*
    Q17 Small-Quantity-Order Revenue Query
    This query determines how much average yearly revenue would be lost if orders were no longer filled for small
    quantities of certain parts. This may reduce overhead expenses by concentrating sales on larger shipments.

    The Small-Quantity-Order Revenue Query considers parts of a given brand and with a given container type and
    determines the average lineitem quantity of such parts ordered for all orders (past and pending) in the 7-year database.
    What would be the average yearly gross (undiscounted) loss in revenue if orders for these parts with a quantity
    of less than 20% of this average were no longer taken?

    Planner enahancement: aggregation pull up through join.
*/
explain
select
	sum(l_extendedprice) / 7.0 as avg_yearly
from
	lineitem,
	part
where
	p_partkey = l_partkey
	and p_brand = 'Brand#44'
	and p_container = 'WRAP PKG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);

/*
    Q18 Large Volume Customer Query
    The Large Volume Customer Query ranks customers based on their having placed a large quantity order. Large
    quantity orders are defined as those orders whose total quantity is above a certain level.

    The Large Volume Customer Query finds a list of the top 100 customers who have ever placed large quantity orders.
    The query lists the customer name, customer key, the order key, date and total price and the quantity for the order.

    Planner enhancement: unfold in subquery.
*/
explain
select
	c_name,
	c_custkey,
	o_orderkey,
	o_orderdate,
	o_totalprice,
	sum(l_quantity)
from
	customer,
	orders,
	lineitem
where
	o_orderkey in (
		select
			l_orderkey
		from
			lineitem
		group by
			l_orderkey having
				sum(l_quantity) > 314
	)
	and c_custkey = o_custkey
	and o_orderkey = l_orderkey
group by
	c_name,
	c_custkey,
	o_orderkey,
	o_orderdate,
	o_totalprice
order by
	o_totalprice desc,
	o_orderdate
limit 100;

/*
    Q19 Discounted Revenue Query
    The Discounted Revenue Query reports the gross discounted revenue attributed to the sale of selected parts handled
    in a particular manner. This query is an example of code such as might be produced programmatically by a data
    mining tool.

    The Discounted Revenue query finds the gross discounted revenue for all orders for three different types of parts
    that were shipped by air and delivered in person. Parts are selected based on the combination of specific brands, a
    list of containers, and a range of sizes.
*/
explain
select
	sum(l_extendedprice* (1 - l_discount)) as revenue
from
	lineitem,
	part
where
	(
		p_partkey = l_partkey
		and p_brand = 'Brand#52'
		and p_container in ('SM CASE', 'SM BOX', 'SM PACK', 'SM PKG')
		and l_quantity >= 4 and l_quantity <= 4 + 10
		and p_size between 1 and 5
		and l_shipmode in ('AIR', 'AIR REG')
		and l_shipinstruct = 'DELIVER IN PERSON'
	)
	or
	(
		p_partkey = l_partkey
		and p_brand = 'Brand#11'
		and p_container in ('MED BAG', 'MED BOX', 'MED PKG', 'MED PACK')
		and l_quantity >= 18 and l_quantity <= 18 + 10
		and p_size between 1 and 10
		and l_shipmode in ('AIR', 'AIR REG')
		and l_shipinstruct = 'DELIVER IN PERSON'
	)
	or
	(
		p_partkey = l_partkey
		and p_brand = 'Brand#51'
		and p_container in ('LG CASE', 'LG BOX', 'LG PACK', 'LG PKG')
		and l_quantity >= 29 and l_quantity <= 29 + 10
		and p_size between 1 and 15
		and l_shipmode in ('AIR', 'AIR REG')
		and l_shipinstruct = 'DELIVER IN PERSON'
	);

/*
    Q20 Potential Part Promotion Query
    The Potential Part Promotion Query identifies suppliers in a particular nation having selected parts that may be candidates
    for a promotional offer.

    The Potential Part Promotion query identifies suppliers who have an excess of a given part available; an excess is
    defined to be more than 50% of the parts like the given part that the supplier shipped in a given year for a given
    nation. Only parts whose names share a certain naming convention are considered.
*/
explain
select
	s_name,
	s_address
from
	supplier,
	nation
where
	s_suppkey in (
		select
			ps_suppkey
		from
			partsupp
		where
			ps_partkey in (
				select
					p_partkey
				from
					part
				where
					p_name like 'green%'
			)
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1993-01-01'
					and l_shipdate < date_add('1993-01-01', interval '1' year)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'ALGERIA'
order by
	s_name;

/*
    Q21 Suppliers Who Kept Orders Waiting Query
    This query identifies certain suppliers who were not able to ship required parts in a timely manner.

    The Suppliers Who Kept Orders Waiting query identifies suppliers, for a given nation, whose product was part of a
    multi-supplier order (with current status of 'F') where they were the only supplier who failed to meet the committed
    delivery date.
*/
explain
select
	s_name,
	count(*) as numwait
from
	supplier,
	lineitem l1,
	orders,
	nation
where
	s_suppkey = l1.l_suppkey
	and o_orderkey = l1.l_orderkey
	and o_orderstatus = 'F'
	and l1.l_receiptdate > l1.l_commitdate
	and exists (
		select
			*
		from
			lineitem l2
		where
			l2.l_orderkey = l1.l_orderkey
			and l2.l_suppkey <> l1.l_suppkey
	)
	and not exists (
		select
			*
		from
			lineitem l3
		where
			l3.l_orderkey = l1.l_orderkey
			and l3.l_suppkey <> l1.l_suppkey
			and l3.l_receiptdate > l3.l_commitdate
	)
	and s_nationkey = n_nationkey
	and n_name = 'EGYPT'
group by
	s_name
order by
	numwait desc,
	s_name
limit 100;

/*
    Q22 Global Sales Opportunity Query
    The Global Sales Opportunity Query identifies geographies where there are customers who may be likely to make a
    purchase.

    This query counts how many customers within a specific range of country codes have not placed orders for 7 years
    but who have a greater than average “positive” account balance. It also reflects the magnitude of that balance.
    Country code is defined as the first two characters of c_phone.
*/
explain
select
	cntrycode,
	count(*) as numcust,
	sum(c_acctbal) as totacctbal
from
	(
		select
			substring(c_phone from 1 for 2) as cntrycode,
			c_acctbal
		from
			customer
		where
			substring(c_phone from 1 for 2) in
				('20', '40', '22', '30', '39', '42', '21')
			and c_acctbal > (
				select
					avg(c_acctbal)
				from
					customer
				where
					c_acctbal > 0.00
					and substring(c_phone from 1 for 2) in
						('20', '40', '22', '30', '39', '42', '21')
			)
			and not exists (
				select
					*
				from
					orders
				where
					o_custkey = c_custkey
			)
	) as custsale
group by
	cntrycode
order by
	cntrycode;