DROP TABLE IF EXISTS customer;
DROP TABLE IF EXISTS orders;
DROP TABLE IF EXISTS q22_customer_tmp;
DROP TABLE IF EXISTS q22_customer_tmp1;
DROP TABLE IF EXISTS q22_orders_tmp;
DROP TABLE IF EXISTS q22_global_sales_opportunity;

-- create tables and load data
create external table customer (C_CUSTKEY INT, C_NAME STRING, C_ADDRESS STRING, C_NATIONKEY INT, C_PHONE STRING, C_ACCTBAL DOUBLE, C_MKTSEGMENT STRING, C_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/customer';
create external table orders (O_ORDERKEY INT, O_CUSTKEY INT, O_ORDERSTATUS STRING, O_TOTALPRICE DOUBLE, O_ORDERDATE STRING, O_ORDERPRIORITY STRING, O_CLERK STRING, O_SHIPPRIORITY INT, O_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/orders';

-- create target tables
create table q22_customer_tmp(c_acctbal double, c_custkey int, cntrycode string);
create table q22_customer_tmp1(avg_acctbal double);
create table q22_orders_tmp(o_custkey int);
create table q22_global_sales_opportunity(cntrycode string, numcust int, totacctbal double);

-- the query
insert overwrite table q22_customer_tmp
select 
  c_acctbal, c_custkey, substr(c_phone, 1, 2) as cntrycode
from 
  customer;
 
insert overwrite table q22_customer_tmp1
select
  avg(c_acctbal)
from
  q22_customer_tmp
where
  c_acctbal > 0.00;

insert overwrite table q22_orders_tmp
select 
  o_custkey 
from 
  orders
group by 
  o_custkey;

insert overwrite table q22_global_sales_opportunity
select
  cntrycode, count(1) as numcust, sum(c_acctbal) as totacctbal
from
(
  select cntrycode, c_acctbal, avg_acctbal from
  q22_customer_tmp1 ct1 join
  (
    select cntrycode, c_acctbal from
      q22_orders_tmp ot 
      right outer join q22_customer_tmp ct 
      on
        ct.c_custkey = ot.o_custkey
  ) ct2
) a
where
  c_acctbal > avg_acctbal
group by cntrycode
order by cntrycode;