How to loop through a query using LINQPAD?

Question

I have this query in LINQPAD:
SELECT TIME_TEST+TIME_STEP AS Productive_Time
FROM PFODS.PPL_TESTSYSTEMS_UTILISATION
WHERE (SYSTEMTYPE = '0005-064') AND
(TS_START >= to_date('13/01/2014', 'DD/MM/YYYY'))
AND (TS_End <= to_date('18/01/2014 00:1:59', 'DD/MM/YYYY HH24:MI:SS')) AND MONO != '9999999999'
Order by TS_START ASC
However, I need to extract out the SELECT SUM(TIME_TEST+TIME_STEP) as ProductiveTime on a daily basis, and thus I need to execute those below codes each time to extract out each day values. How do I combine those into 1 single query such that each day data
can be displayed? Do I need to write a loop inside the WHERE condition?
SELECT SUM(TIME_TEST+TIME_STEP) as ProductiveTime
FROM PFODS.PPL_TESTSYSTEMS_UTILISATION
WHERE (SYSTEMTYPE = '0005-064') AND
(TS_START >= to_date('13/01/2014', 'DD/MM/YYYY'))
AND (TS_End <= to_date('14/01/2014 00:1:59', 'DD/MM/YYYY HH24:MI:SS')) AND MONO != '9999999999'
Order by TS_START ASC
SELECT SUM(TIME_TEST+TIME_STEP) as ProductiveTime
FROM PFODS.PPL_TESTSYSTEMS_UTILISATION
WHERE (SYSTEMTYPE = '0005-064') AND
(TS_START >= to_date('14/01/2014', 'DD/MM/YYYY'))
AND (TS_End <= to_date('15/01/2014 00:1:59', 'DD/MM/YYYY HH24:MI:SS')) AND MONO != '9999999999'
Order by TS_START ASC
SELECT SUM(TIME_TEST+TIME_STEP) as ProductiveTime
FROM PFODS.PPL_TESTSYSTEMS_UTILISATION
WHERE (SYSTEMTYPE = '0005-064') AND
(TS_START >= to_date('15/01/2014', 'DD/MM/YYYY'))
AND (TS_End <= to_date('16/01/2014 00:1:59', 'DD/MM/YYYY HH24:MI:SS')) AND MONO != '9999999999'
Order by TS_START ASC
SELECT SUM(TIME_TEST+TIME_STEP) as ProductiveTime
FROM PFODS.PPL_TESTSYSTEMS_UTILISATION
WHERE (SYSTEMTYPE = '0005-064') AND
(TS_START >= to_date('16/01/2014', 'DD/MM/YYYY'))
AND (TS_End <= to_date('17/01/2014 00:1:59', 'DD/MM/YYYY HH24:MI:SS')) AND MONO != '9999999999'
Order by TS_START ASC
SELECT SUM(TIME_TEST+TIME_STEP) as ProductiveTime
FROM PFODS.PPL_TESTSYSTEMS_UTILISATION
WHERE (SYSTEMTYPE = '0005-064') AND
(TS_START >= to_date('17/01/2014', 'DD/MM/YYYY'))
AND (TS_End <= to_date('18/01/2014 00:1:59', 'DD/MM/YYYY HH24:MI:SS')) AND MONO != '9999999999'
Order by TS_START ASC
In addition to display the SUM(TIME_TEST+TIME_STEP) for each day, I also need to display the date itself.
I do no want (cannot) to write anything on Stored Procedure, and I can only write simple query.
thanks. 

Answer 1

Use a loop like the code below
DateTime startDate = DateTime.Parse("1/1/14");
DateTime endDate = DateTime.Parse("2/16/14");
int numberOfDays = (endDate - startDate).Days + 1;
for (int dateCount = 0; dateCount < numberOfDays; dateCount++)
DateTime currentDate = startDate.AddDays(dateCount);
Even better use a dictionary like in the code below
static void Main(string[] args)
DataTable table = new DataTable();
Dictionary<DateTime, List<DataRow>> dict = table.AsEnumerable()
.GroupBy(x => x.Field<DateTime>("TS_START").Date, x => x)
.ToDictionary(x => x.Key, x => x.ToList());
Console.WriteLine("Date ProductiveTime Comment");
Console.WriteLine("========== ==========");
foreach(DateTime date in dict.Keys)
List<DataRow> dateRows = dict[date];
int productiveTime = dateRows.AsEnumerable()
.Select(x => x.Field<int>("PRODUCTIVE_TIME"))
.ToList().Sum();
int firstRow = table.Rows.IndexOf(dateRows[0]);
int LastRow = table.Rows.IndexOf(dateRows[dateRows.Count - 1]);
Console.WriteLine("{0} {1} Row{2} to Row{3}",
date.ToShortDateString(), productiveTime.ToString(),
firstRow.ToString(), LastRow.ToString());