SQL Server = Creating a stored procedure - sql

Question

CREATE TABLE dbo.HighScores
(
[User] varchar(255),
Score int,
DateAdded datetime
)
INSERT INTO dbo.HighScores
VALUES ('Bob', 2500, '2 Jan 2013 13:13'),
('Jon', 1500, '2 Jan 2013 13:15'),
('Amy', 3500, '2 Jan 2013 13:18'),
('Joe', 1750, '2 Jan 2013 13:23'),
('Don', 500, '2 Jan 2013 13:33'),
('Ann', 800, '2 Jan 2013 14:03'),
('Mav', 1200, '2 Jan 2013 15:13'),
('Ken', 2600, '2 Jan 2013 15:32'),
('Ace', 2500, '2 Jan 2013 16:45'),
('Tom', 2700, '2 Jan 2013 16:59'),
('Leo', 300, '2 Jan 2013 17:33'),
('Jay', 1000, '2 Jan 2013 18:03'),
('Roy', 1200, '2 Jan 2013 18:13'),
('Vic', 2100, '2 Jan 2013 19:32'),
('Ted', 1800, '2 Jan 2013 20:45'),
('Pat', 1400, '2 Jan 2013 20:59')
create a stored procedure called pr_GetHighScoreList
We now need to add highscores to the table using pr_PutHighScoreList
• You can only appear on the high score list once, and only your highest score must be stored.
• We would also need to record the movement in the highscore table, when players move up in position.
Example:
pr_PutHighScoreList 'Ann', 2750
Will increase Ann's score from 800 to 2750 and we need to record that she moved from position 14 to 2 in a separate table.
• Create the proc, and any other objects that may be required to store this.
This is what i did so far:
ALTER PROCEDURE [dbo].[pr_PutHighScoreList]
(
#name as nvarchar(20),
#score as int
)
AS
BEGIN
IF EXISTS
(SELECT * from [HighScores]
WHERE [User]=#name
AND [Score]>#score)
UPDATE [HighScores]
SET [User] = #name
,[Score] = #score
,[DateAdded] = getdate()
WHERE [User]=#name
ELSE
(SELECT * from [HighScores]
WHERE [User]!= #name)
INSERT INTO [HighScores]
([User]
,[Score]
,[DateAdded])
VALUES
(#name
,#score
,getdate())
END

Answer 1

Perhaps this will get you started
;with cte as (
Select *
,RN = row_number() over (order by score desc,dateAdded desc)
From HighScores
)
Select * From cte where RN<=5
Union
Select A.*
From cte A
Join (Select R1=RN-1,R2=RN+1 from cte where [User]='Ann' ) B on A.RN between B.R1 and B.R2
Order by RN
Results

Answer 2

I would use lag() and lead() for Ann and her neighbors. This is what a query looks like:
select *
from (select hs.*,
row_number() over (order by score desc, [User]) as seqnum,
lag([User]) over (order by score desc, [User]) as prev_user,
lead([User]) over (order by score desc, [User]) as next_user
from highscores hs
) hs
where seqnum <= 5 or
'Ann' in ([User], prev_user, next_user)
order by seqnum;
You can adapt it for a stored procedure.
Here is a db<>fiddle.