Hello coders, today we are going to solve Occupations HackerRank Solution in SQL.
Pivot the Occupation column in OCCUPATIONS so that each Name is sorted alphabetically and displayed underneath its corresponding Occupation. The output column headers should be Doctor, Professor, Singer, and Actor, respectively.
Note: Print NULL when there are no more names corresponding to an occupation.
The OCCUPATIONS table is described as follows:
Occupation will only contain one of the following values: Doctor, Professor, Singer or Actor.
Jenny Ashley Meera Jane Samantha Christeen Priya Julia NULL Ketty NULL Maria
The first column is an alphabetically ordered list of Doctor names.
The second column is an alphabetically ordered list of Professor names.
The third column is an alphabetically ordered list of Singer names.
The fourth column is an alphabetically ordered list of Actor names.
The empty cell data for columns with less than the maximum number of names per occupation (in this case, the Professor and Actor columns) are filled with NULL values.
Solution – Occupations in SQL
set @r1=0, @r2=0, @r3=0, @r4=0; select min(Doctor), min(Professor), min(Singer), min(Actor) from(select case when Occupation="Doctor" then (@r1:=@r1+1) when Occupation="Professor" then (@r2:=@r2+1) when Occupation="Singer" then (@r3:=@r3+1) when Occupation="Actor" then (@r4:=@r4+1) end as RowNumber, case when Occupation="Doctor" then Name end as Doctor, case when Occupation="Professor" then Name end as Professor, case when Occupation="Singer" then Name end as Singer, case when Occupation="Actor" then Name end as Actor from OCCUPATIONS order by Name ) Temp group by RowNumber;
Disclaimer: The above Problem (Occupations) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.