SQL206 SQL Median

Median SQL Programming Median query – How to calculate the median Parts Median

Notes on Median Slides ,[object Object],[object Object],[object Object],[object Object],Parts Median

Median Resources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Parts Median

Assumptions ,[object Object],[object Object],Parts Median

Business Case ,[object Object],[object Object],[object Object],[object Object],[object Object],Parts Median

Approach ,[object Object],[object Object],[object Object],[object Object],Parts Median

Create Table ,[object Object],Parts Median CREATE TABLE Parts (part_nbr VARCHAR(5) NOT NULL PRIMARY KEY , part_name VARCHAR(50) NOT NULL , part_color VARCHAR(50) NOT NULL , part_wgt INTEGER NOT NULL , city_name VARCHAR(50) NOT NULL );

Load Data ,[object Object],Parts Median INSERT INTO Parts (part_nbr, part_name, part_color, part_wgt, city_name) VALUES ('p1', 'Nut', 'Red', 12, 'London') , ('p2', 'Bolt', 'Green', 17, 'Paris') , ('p3', 'Cam', 'Blue', 12, 'Paris') , ('p4', 'Screw', 'Red', 14, 'London') , ('p5', 'Cam', 'Blue', 12, 'Paris') , ('p6', 'Cog', 'Red', 19, 'London') ;

Calculate the median ,[object Object],Parts Median select avg(wgt) as median from (select max(part_wgt) as wgt From (select top 50 percent * from parts order by part_wgt asc) a union select min(part_wgt) from (select top 50 percent * from parts order by part_wgt desc) d) u;

Explanation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Parts Median

SQL206 SQL Median

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SQL206 SQL Median