tasks/readable/022/task_readable.md

Task: 022

Database: retails

Question

Show the customer with the highest account balance for each area.

Gold Query

SELECT c_mktsegment, c_custkey, c_name, c_acctbal
FROM (
SELECT c.c_mktsegment,
c.c_custkey,
c.c_name,
c.c_acctbal,
RANK() OVER (PARTITION BY c.c_mktsegment ORDER BY c.c_acctbal DESC) AS rn
FROM customer c
) t
WHERE rn = 1;

Execution Result:

c_mktsegment	c_custkey	c_name	c_acctbal
AUTOMOBILE	21734	Customer#000021734	9998.72
BUILDING	330	Customer#000000330	9999.59
FURNITURE	72823	Customer#000072823	9999.65
HOUSEHOLD	48616	Customer#000048616	9999.84
MACHINERY	14740	Customer#000014740	9999.96

5 rows