DROP TABLE IF EXISTS lineitem;
DROP TABLE IF EXISTS part;
DROP TABLE IF EXISTS q14_promotion_effect;

-- create the tables and load the data
create external table lineitem (L_ORDERKEY INT, L_PARTKEY INT, L_SUPPKEY INT, L_LINENUMBER INT, L_QUANTITY DOUBLE, L_EXTENDEDPRICE DOUBLE, L_DISCOUNT DOUBLE, L_TAX DOUBLE, L_RETURNFLAG STRING, L_LINESTATUS STRING, L_SHIPDATE STRING, L_COMMITDATE STRING, L_RECEIPTDATE STRING, L_SHIPINSTRUCT STRING, L_SHIPMODE STRING, L_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/100/lineitem';
create external table part (P_PARTKEY INT, P_NAME STRING, P_MFGR STRING, P_BRAND STRING, P_TYPE STRING, P_SIZE INT, P_CONTAINER STRING, P_RETAILPRICE DOUBLE, P_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/100/part';

-- create the result table
create table q14_promotion_effect(promo_revenue double);

-- the query
insert overwrite table q14_promotion_effect
select 
  100.00 * sum(case
               when p_type like 'PROMO%'
               then l_extendedprice*(1-l_discount)
               else 0.0
               end
  ) / sum(l_extendedprice * (1 - l_discount)) as promo_revenue
from 
  part p join lineitem l 
  on 
    l.l_partkey = p.p_partkey and l.l_shipdate >= '1995-09-01' and l.l_shipdate < '1995-10-01';