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Vivek's SQL Notes

Vivek johari is currently a Analyst and have more that 5.5 yeras of experience in database. He has Master degree in Computer and also he is Microsoft certified Sql DBA (MCTS)& Microsoft certified SQl BI professional(MCTS). He is also Oracle certified profession(OCP)DBA in ORACLE 10g and ORACLE 9i.He has the experience of working in PL/SQL, T-SQL and SSIS/SSRS. His work basically involved designing and optimization of the Database.He has also published many database articles on his blog Technologies with Vivek Johari.

Answer - Question of the Week - 28/12/2013 - Question 2

Question:- Suppose we have a table named tbl_charactername have only one column say "charactername".
It contains 10 rows. First 5 rows contains "Vivek Johari" and the next 5 rows contains "Abhinav Golwalkar"

tbl_charactername
---------------------
Vivek Johari
Vivek Johari
Vivek Johari
Vivek Johari
Vivek Johari
Abhinav Golwalkar
Abhinav Golwalkar
Abhinav Golwalkar
Abhinav Golwalkar
Abhinav Golwalkar

Now we need a SQL Query which can return the result in the form

Desired Result:-

Vivek Johari
Abhinav Golwalkar
Vivek Johari
Abhinav Golwalkar
Vivek Johari
Abhinav Golwalkar
Vivek Johari
Abhinav Golwalkar
Vivek Johari
Abhinav Golwalkar

Query should work even if the table has 30 rows with first 15 contains "vivek johari" and next 15 contains "Abhinav Golwalkar" or 40 rows with first 20 contains "vivek johari" and next 20 contains "Abhinav Golwalkar" etc. But output should contains "Vivek Johari" and "Abhinav Golwalkar" in alternate rows.

Keep Answering.......:-)

Answer:-


We have got three method to solve this problem.Thanks to Aviral Lamba and Sean Senneka for giving the correct answer.

Answer given by Aviral lamba

SELECT CASE WHEN (A.ROW1 % 2)=0 THEN 'Vivek Johari' WHEN (A.ROW1 % 2)=1 THEN 'Abhinav Golwalkar' end PERSONNAME FROM(
SELECT charactername,ROW_NUMBER()OVER (ORDER BY charactername)AS ROW1 FROM tbl_charactername )A

Answer Given by Sean Senneka

Answer 1 :-

SELECT charactername
, ROW_NUMBER() OVER (PARTITION BY charactername ORDER BY charactername) ordby
FROM tbl_charactername
ORDER BY 2,1

Answer 2:-

SELECT charactername
FROM tbl_charactername
ORDER BY ROW_NUMBER() OVER (PARTITION BY charactername ORDER BY charactername) ASC,charactername DESC

For me the second answer given by Sean is the best as it neither use any hardcore value and also gives the desired column.



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