SQL how to create detail table from summary table - sql

Question

Now I have a game summary table like this:
And I want to split the "starttime" and "endtime" by hours and to convert it into following detailed look:
It's kind of similar as Unpivot but not exactly the same. How should I write the sql statement? Thanks a tons!!

Answer 1

In PostgreSQL is:
SELECT PlayerID
, generate_series(s.StartTime, s.EndTime - 1) AS StartTimeCol
, generate_series(s.StartTime + 1, s.EndTime) AS EndTimeCol
FROM summaryTable s
In this Link you can see how to add generate_series function to SQL Server 2008.
View in action Here

Answer 2

If you're on SQL Server, you can try the following TSQL block. It uses a cursor to traverse those rows which have more than 1 hour between start and end times, and iterates through, adding the individual "hours" into a #gamesTable table variable.
Once the cursor is done and has populated records into the #gamesTable variable, a SELECT statement against the original table for those rows which have 1 or less hours between start and end times is unioned to all the rows that were stored into #gamesTable.
DECLARE Game_Cursor CURSOR FOR
SELECT *
FROM summaryTable
WHERE EndTime - StartTime > 1
OPEN Game_Cursor;
DECLARE #PlayerID char
DECLARE #StartTime int
DECLARE #EndTime int
DECLARE #TempEndTime int
DECLARE #gamesTable TABLE(PlayerID char, StartTime int, EndTime int)
--Fetch the first row
FETCH NEXT FROM Game_Cursor INTO #PlayerID, #StartTime, #EndTime
WHILE ##FETCH_STATUS = 0
BEGIN
WHILE (#EndTime - #StartTime) > 0
BEGIN
SET #TempEndTime = #StartTime + 1
INSERT INTO #gamesTable
SELECT #PlayerID AS PlayerID, #StartTime AS StartTime, #TempEndTime AS EndTime
SET #StartTime = #StartTime + 1
END;
--Fetch the next row
FETCH NEXT FROM Game_Cursor INTO #PlayerID, #StartTime, #EndTime
END;
--Rid of the cursor
CLOSE Game_Cursor;
DEALLOCATE Game_Cursor;
--Output the results
SELECT * FROM summaryTable WHERE (EndTime - StartTime) <= 1
UNION ALL
SELECT * FROM #gamesTable

Answer 3

In SQL Server 2005+ you can use CTE to get the results:
;with cte (playerid, starttime, endtime) as
(
select playerid, min(starttime) starttime, max(endtime) endtime
from yourtable
group by playerid
union all
select playerid, starttime + 1, endtime
from cte
where starttime < endtime
)
select playerid,
starttime,
case
when starttime + 1 < endtime
then starttime + 1
else endtime
end endtime
from cte
where starttime != endtime
order by playerid, starttime
See SQL Fiddle with Demo