type
Post
Created date
Nov 7, 2022 11:15 AM
category
Data Science
tags
Data Warehousing
status
Published
Language
English
From
School
summary
slug
password
Author
Jason Ching Yuen Siu
Priority
Featured
Featured
Cover
Origin
Type
URL
Youtube
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Orders of attributes inside CUBE
matter
CUBE
matterWhen using
CUBE
, think about which ones are ‘NULL’. Those which are (NULL) need to be placed at LAST. -- wrong SELECT c.time_id As Period, p.emp_num AS Pilot, c.mod_code As Model, SUM(c.tot_fuel) FROM dw.charter_fact c, dw.pilot p, dw.model m WHERE c.emp_num = p.emp_num AND c.mod_code = m.mod_code AND c.time_id LIKE '19951%' AND p.pil_license = 'COM' AND c.mod_code = 'C-90A' GROUP BY CUBE(c.mod_code, p.emp_num, c.time_id) ORDER BY c.time_id; -- correct SELECT c.time_id As Period, p.emp_num AS Pilot, c.mod_code As Model, SUM(c.tot_fuel) FROM dw.charter_fact c, dw.pilot p, dw.model m WHERE c.emp_num = p.emp_num AND c.mod_code = m.mod_code AND c.time_id LIKE '19951%' AND p.pil_license = 'COM' AND c.mod_code = 'C-90A' GROUP BY CUBE( c.time_id, p.emp_num, c.mod_code) ORDER BY c.time_id;

What is GROUPING
?
GROUPING
?


What is DECODE
?
DECODE
?
What is PARTIAL CUBE
?
PARTIAL CUBE
?Problem
Code
SELECT DECODE(GROUPING(time_id), 1, 'All Periods', time_id) As Period, DECODE(GROUPING(c.emp_num), 1, 'All Pilots', c.emp_num) AS Pilot, DECODE(GROUPING(mod_code), 1, 'All Models', mod_code) As Model, SUM(tot_fuel) FROM dw.charter_fact c, dw.pilot p WHERE c.emp_num = p.emp_num AND time_id LIKE '19951%' AND mod_code = 'C-90A' AND p.pil_license = 'COM' GROUP BY CUBE (time_id, c.emp_num, mod_code) ORDER BY time_id;

Solution


Code
-- Partial Cube SELECT DECODE(GROUPING(time_id), 1, 'All Periods', time_id) As Period, DECODE(GROUPING(c.emp_num), 1, 'All Pilots', c.emp_num) AS Pilot, DECODE(GROUPING(mod_code), 1, 'All Models', mod_code) As Model, SUM(tot_fuel) FROM dw.charter_fact c, dw.pilot p WHERE c.emp_num = p.emp_num AND time_id LIKE '19951%' AND mod_code = 'C-90A' AND p.pil_license = 'COM' GROUP BY CUBE (time_id, c.emp_num), mod_code ORDER BY time_id;
- Author:Jason Siu
- URL:https://jason-siu.com/article/808b1217-107b-40d6-8535-214bd6a31069
- Copyright:All articles in this blog, except for special statements, adopt BY-NC-SA agreement. Please indicate the source!
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