Counting Number of calls Occurring at the same time (Concurrent)

Hi All,
Thanks for the help in advance. I have a T-SQL problem I’m not sure how to solve. I have a table which holds calls. The table gives a start time and a booked duration time which I can use to create a booked end time.
I would like to count the number of concurrent number of calls in 15 minute periods for a specific date range. In other words – I could like to count the number of calls which are scheduled to occur at the same 15 minute time periods.
To obtain the 15 minute periods I can join to a table we have specifically for this (a time look up table) so I the Call Start and Call End to the nearest 15 min slot.
The base data looks like this (CallID is unique):
I would like the results set to give a list of 15 min time periods (in DATETIME) with a count of Calls occurring in the time period.
Here's a mockup in Excel:
Can anyone give a good solution. I suspect a CTE would be used – but I’m not sure how.
Many Thanks,
UnoT

Try this on:
DECLARE @CallsSample TABLE (CallID bigint NOT NULL, call_datetime smalldatetime NOT NULL, booked_duration int NOT NULL, BookedCallEnd smalldatetime NULL, Start_Qtr_Hr_15_Min time(7) NOT NULL, End_Qtr_Hr_15_Min time(7) NOT NULL)
INSERT @CallsSample (CallID, call_datetime, booked_duration, BookedCallEnd, Start_Qtr_Hr_15_Min, End_Qtr_Hr_15_Min) VALUES
(3487817, CAST(0xA460001E AS SmallDateTime), 90, CAST(0xA4600078 AS SmallDateTime), CAST(0x070034E230040000 AS Time), CAST(0x0700D088C3100000 AS Time)),(6177710, CAST(0xA460003C AS SmallDateTime), 115, CAST(0xA46000AF AS SmallDateTime), CAST(0x070068C461080000 AS Time), CAST(0x07001EDC0C170000 AS Time)),(4059343, CAST(0xA460004B AS SmallDateTime), 60, CAST(0xA4600087 AS SmallDateTime), CAST(0x070082357A0A0000 AS Time), CAST(0x0700EAF9DB120000 AS Time)),(60817427, CAST(0xA4600087 AS SmallDateTime), 30, CAST(0xA46000A5 AS SmallDateTime), CAST(0x0700EAF9DB120000 AS Time), CAST(0x07001EDC0C170000 AS Time)),(6689941, CAST(0xA4600096 AS SmallDateTime), 60, CAST(0xA46000D2 AS SmallDateTime), CAST(0x0700046BF4140000 AS Time), CAST(0x07006C2F561D0000 AS Time)),(10587832, CAST(0xA4600096 AS SmallDateTime), 60, CAST(0xA46000D2 AS SmallDateTime), CAST(0x0700046BF4140000 AS Time), CAST(0x07006C2F561D0000 AS Time)),(1775751, CAST(0xA46000F0 AS SmallDateTime), 720, CAST(0xA46003C0 AS SmallDateTime), CAST(0x0700A01187210000 AS Time), CAST(0x070080461C860000 AS Time)),(4492298, CAST(0xA46000F0 AS SmallDateTime), 30, CAST(0xA460010E AS SmallDateTime), CAST(0x0700A01187210000 AS Time), CAST(0x0700D4F3B7250000 AS Time)),(10033683, CAST(0xA4600104 AS SmallDateTime), 45, CAST(0xA4600131 AS SmallDateTime), CAST(0x0700BA829F230000 AS Time), CAST(0x070008D6E8290000 AS Time)),(3073339, CAST(0xA460012C AS SmallDateTime), 0, CAST(0xA460012C AS SmallDateTime), CAST(0x070008D6E8290000 AS Time), CAST(0x070008D6E8290000 AS Time)),(11211077, CAST(0xA460014A AS SmallDateTime), 30, CAST(0xA4600168 AS SmallDateTime), CAST(0x07003CB8192E0000 AS Time), CAST(0x0700709A4A320000 AS Time)),(95075608, CAST(0xA4600168 AS SmallDateTime), 20, CAST(0xA460017C AS SmallDateTime), CAST(0x0700709A4A320000 AS Time), CAST(0x07008A0B63340000 AS Time)),(10569182, CAST(0xA4600168 AS SmallDateTime), 60, CAST(0xA46001A4 AS SmallDateTime), CAST(0x0700709A4A320000 AS Time), CAST(0x0700D85EAC3A0000 AS Time)),(87260179, CAST(0xA4600168 AS SmallDateTime), 60, CAST(0xA46001A4 AS SmallDateTime), CAST(0x0700709A4A320000 AS Time), CAST(0x0700D85EAC3A0000 AS Time)),(60818683, CAST(0xA4600177 AS SmallDateTime), 30, CAST(0xA4600195 AS SmallDateTime), CAST(0x07008A0B63340000 AS Time), CAST(0x0700BEED93380000 AS Time)),(10366434, CAST(0xA460017C AS SmallDateTime), 5, CAST(0xA4600181 AS SmallDateTime), CAST(0x07008A0B63340000 AS Time), CAST(0x07008A0B63340000 AS Time)),(57064108, CAST(0xA460019F AS SmallDateTime), 45, CAST(0xA46001CC AS SmallDateTime), CAST(0x0700BEED93380000 AS Time), CAST(0x07000C41DD3E0000 AS Time)),(2257193, CAST(0xA46001A4 AS SmallDateTime), 180, CAST(0xA4600258 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070010ACD1530000 AS Time)),(3842940, CAST(0xA46001A4 AS SmallDateTime), 90, CAST(0xA46001FE AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070074053F470000 AS Time)),(4407600, CAST(0xA46001A4 AS SmallDateTime), 60, CAST(0xA46001E0 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070040230E430000 AS Time)),(6815326, CAST(0xA46001A4 AS SmallDateTime), 90, CAST(0xA46001FE AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070074053F470000 AS Time)),(6977921, CAST(0xA46001A4 AS SmallDateTime), 45, CAST(0xA46001D1 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070026B2F5400000 AS Time)),(8265287, CAST(0xA46001A4 AS SmallDateTime), 150, CAST(0xA460023A AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(51019423, CAST(0xA46001A4 AS SmallDateTime), 12, CAST(0xA46001B0 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x0700D85EAC3A0000 AS Time)),(53753674, CAST(0xA46001A4 AS SmallDateTime), 60, CAST(0xA46001E0 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070040230E430000 AS Time)),(55205083, CAST(0xA46001A4 AS SmallDateTime), 60, CAST(0xA46001E0 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070040230E430000 AS Time)),(70980359, CAST(0xA46001A4 AS SmallDateTime), 60, CAST(0xA46001E0 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070040230E430000 AS Time)),(79589562, CAST(0xA46001A4 AS SmallDateTime), 60, CAST(0xA46001E0 AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x070040230E430000 AS Time)),(84884442, CAST(0xA46001A4 AS SmallDateTime), 120, CAST(0xA460021C AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(34352531, CAST(0xA46001AE AS SmallDateTime), 30, CAST(0xA46001CC AS SmallDateTime), CAST(0x0700D85EAC3A0000 AS Time), CAST(0x07000C41DD3E0000 AS Time)),(51675477, CAST(0xA46001B3 AS SmallDateTime), 60, CAST(0xA46001EF AS SmallDateTime), CAST(0x0700F2CFC43C0000 AS Time), CAST(0x07005A9426450000 AS Time)),(57128114, CAST(0xA46001B3 AS SmallDateTime), 45, CAST(0xA46001E0 AS SmallDateTime), CAST(0x0700F2CFC43C0000 AS Time), CAST(0x070040230E430000 AS Time)),(60819106, CAST(0xA46001B3 AS SmallDateTime), 30, CAST(0xA46001D1 AS SmallDateTime), CAST(0x0700F2CFC43C0000 AS Time), CAST(0x070026B2F5400000 AS Time)),(62155430, CAST(0xA46001B3 AS SmallDateTime), 44, CAST(0xA46001DF AS SmallDateTime), CAST(0x0700F2CFC43C0000 AS Time), CAST(0x070026B2F5400000 AS Time)),(25999755, CAST(0xA46001B8 AS SmallDateTime), 125, CAST(0xA4600235 AS SmallDateTime), CAST(0x0700F2CFC43C0000 AS Time), CAST(0x0700C258884D0000 AS Time)),(26122354, CAST(0xA46001B8 AS SmallDateTime), 125, CAST(0xA4600235 AS SmallDateTime), CAST(0x0700F2CFC43C0000 AS Time), CAST(0x0700C258884D0000 AS Time)),(27954520, CAST(0xA46001B8 AS SmallDateTime), 125, CAST(0xA4600235 AS SmallDateTime), CAST(0x0700F2CFC43C0000 AS Time), CAST(0x0700C258884D0000 AS Time)),
(96547161, CAST(0xA46001C2 AS SmallDateTime), 60, CAST(0xA46001FE AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x070074053F470000 AS Time)),(1288784, CAST(0xA46001C2 AS SmallDateTime), 90, CAST(0xA460021C AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(6852900, CAST(0xA46001C2 AS SmallDateTime), 60, CAST(0xA46001FE AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x070074053F470000 AS Time)),(8159548, CAST(0xA46001C2 AS SmallDateTime), 90, CAST(0xA460021C AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10490505, CAST(0xA46001C2 AS SmallDateTime), 90, CAST(0xA460021C AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(11106751, CAST(0xA46001C2 AS SmallDateTime), 15, CAST(0xA46001D1 AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x070026B2F5400000 AS Time)),(32223105, CAST(0xA46001C2 AS SmallDateTime), 60, CAST(0xA46001FE AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x070074053F470000 AS Time)),(8798082, CAST(0xA46001C2 AS SmallDateTime), 60, CAST(0xA46001FE AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x070074053F470000 AS Time)),(20803494, CAST(0xA46001C2 AS SmallDateTime), 300, CAST(0xA46002EE AS SmallDateTime), CAST(0x07000C41DD3E0000 AS Time), CAST(0x07001417C6680000 AS Time)),(10586951, CAST(0xA46001D1 AS SmallDateTime), 60, CAST(0xA460020D AS SmallDateTime), CAST(0x070026B2F5400000 AS Time), CAST(0x07008E7657490000 AS Time)),(94186519, CAST(0xA46001E0 AS SmallDateTime), 120, CAST(0xA4600258 AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x070010ACD1530000 AS Time)),(98317405, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(98683578, CAST(0xA46001E0 AS SmallDateTime), 45, CAST(0xA460020D AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x07008E7657490000 AS Time)),(99071917, CAST(0xA46001E0 AS SmallDateTime), 30, CAST(0xA46001FE AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x070074053F470000 AS Time)),(2740737, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(4384114, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(7996107, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(8294223, CAST(0xA46001E0 AS SmallDateTime), 90, CAST(0xA460023A AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(9164073, CAST(0xA46001E0 AS SmallDateTime), 90, CAST(0xA460023A AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(9443787, CAST(0xA46001E0 AS SmallDateTime), 480, CAST(0xA46003C0 AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x070080461C860000 AS Time)),(9921813, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10449493, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10450055, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10450221, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10450559, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10450836, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10451107, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10451347, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10451597, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(10689864, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(11334051, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(11364433, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(45101155, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(59007149, CAST(0xA46001E0 AS SmallDateTime), 30, CAST(0xA46001FE AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x070074053F470000 AS Time)),(61545449, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(85739178, CAST(0xA46001E0 AS SmallDateTime), 60, CAST(0xA460021C AS SmallDateTime), CAST(0x070040230E430000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(1494995, CAST(0xA46001EF AS SmallDateTime), 30, CAST(0xA460020D AS SmallDateTime), CAST(0x07005A9426450000 AS Time), CAST(0x07008E7657490000 AS Time)),
(4573716, CAST(0xA46001EF AS SmallDateTime), 5, CAST(0xA46001F4 AS SmallDateTime), CAST(0x07005A9426450000 AS Time), CAST(0x07005A9426450000 AS Time)),(10517748, CAST(0xA46001EF AS SmallDateTime), 10, CAST(0xA46001F9 AS SmallDateTime), CAST(0x07005A9426450000 AS Time), CAST(0x07005A9426450000 AS Time)),(11319350, CAST(0xA46001EF AS SmallDateTime), 60, CAST(0xA460022B AS SmallDateTime), CAST(0x07005A9426450000 AS Time), CAST(0x0700C258884D0000 AS Time)),(60819508, CAST(0xA46001EF AS SmallDateTime), 30, CAST(0xA460020D AS SmallDateTime), CAST(0x07005A9426450000 AS Time), CAST(0x07008E7657490000 AS Time)),(80192111, CAST(0xA46001EF AS SmallDateTime), 60, CAST(0xA460022B AS SmallDateTime), CAST(0x07005A9426450000 AS Time), CAST(0x0700C258884D0000 AS Time)),(63151763, CAST(0xA46001F4 AS SmallDateTime), 720, CAST(0xA46004C4 AS SmallDateTime), CAST(0x07005A9426450000 AS Time), CAST(0x07003AC9BBA90000 AS Time)),(97681254, CAST(0xA46001FE AS SmallDateTime), 30, CAST(0xA460021C AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(1279946, CAST(0xA46001FE AS SmallDateTime), 90, CAST(0xA4600258 AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x070010ACD1530000 AS Time)),(2451549, CAST(0xA46001FE AS SmallDateTime), 30, CAST(0xA460021C AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(2992861, CAST(0xA46001FE AS SmallDateTime), 30, CAST(0xA460021C AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(23975539, CAST(0xA46001FE AS SmallDateTime), 30, CAST(0xA460021C AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700A8E76F4B0000 AS Time)),(7116577, CAST(0xA46001FE AS SmallDateTime), 90, CAST(0xA4600258 AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x070010ACD1530000 AS Time)),(9151341, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(9190403, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(9535042, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(9919911, CAST(0xA46001FE AS SmallDateTime), 240, CAST(0xA46002EE AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x07001417C6680000 AS Time)),(10565039, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(11332503, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(11336945, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(11340274, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(41961532, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(61162342, CAST(0xA46001FE AS SmallDateTime), 45, CAST(0xA460022B AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700C258884D0000 AS Time)),(61502310, CAST(0xA46001FE AS SmallDateTime), 20, CAST(0xA4600212 AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x07008E7657490000 AS Time)),(63560086, CAST(0xA46001FE AS SmallDateTime), 100, CAST(0xA4600262 AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x070010ACD1530000 AS Time)),(67801679, CAST(0xA46001FE AS SmallDateTime), 60, CAST(0xA460023A AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700DCC9A04F0000 AS Time)),(69045173, CAST(0xA46001FE AS SmallDateTime), 30, CAST(0xA460021C AS SmallDateTime), CAST(0x070074053F470000 AS Time), CAST(0x0700A8E76F4B0000 AS Time))
DECLARE @times TABLE (start_qtr_hr_15_min TIME)INSERT INTO @times (start_qtr_hr_15_min) VALUES
('00:30:00.0000000'),('01:00:00.0000000'),('01:15:00.0000000'),('02:00:00.0000000'),('02:15:00.0000000'),('02:30:00.0000000'),('02:45:00.0000000'),('03:30:00.0000000'),('04:00:00.0000000'),('04:15:00.0000000'),('04:30:00.0000000'),
('05:00:00.0000000'),('05:30:00.0000000'),('06:00:00.0000000'),('06:15:00.0000000'),('06:45:00.0000000'),('07:00:00.0000000'),('07:15:00.0000000'),('07:30:00.0000000'),('07:45:00.0000000'),('08:00:00.0000000'),('08:15:00.0000000'),
('08:30:00.0000000'),('08:45:00.0000000'),('09:00:00.0000000'),('09:15:00.0000000'),('09:30:00.0000000'),('10:00:00.0000000'),('12:30:00.0000000'),('16:00:00.0000000'),('20:15:00.0000000')
SELECT COUNT(DISTINCT c.callID), c.Start_Qtr_Hr_15_Min
FROM @callsSample c
INNER JOIN @times t
ON t.start_qtr_hr_15_min BETWEEN c.Start_Qtr_Hr_15_Min AND c.End_Qtr_Hr_15_Min
GROUP BY c.Start_Qtr_Hr_15_Min
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please help me with this one i am really stuck.
The situation   : I have two square wave signal, and i want to measure the frequency of both of themat the same time.
the problem : Error -50103 occurred at DAQmx Read (Counter DBL 1Chan 1Samp).vi:3
Please see the attachement.
i also have 3 analog inputs to be measured.
but i dont have any problem with the analog inputs,,,multiple analog inputs can easily be measured,,,,,but the prob lem is in the digitl (square wave ) signals.
Attachments:
i want to use two counter input.GIF ‏54 KB
two counter tasks1.vi ‏250 KB

NI has an excellent overview of the accuracy and tradeoffs of the different freq measurement methods titled "Making Accurate Frequency Measurements." To boil down the essence of it, the (possibly) increased accuracy of the 2-counter method depends on a relatively long collection / accumulation time which would in turn typically limit the rate at which you could update your measured freq value.
Now let me offer some friendly but blunt advice. LabVIEW makes it easy to collect data. However, there are many other factors affecting the usefulness of that data. I support the dictum: "It is hard to measure *well*."  Choice of sensors, their sensitivity to environment, various sources of noise, an understanding of the decision to be made from the data, programming methods, etc. And even more etc.
What I mean is that just because a hardware freq measurement can be performed that is precise to 1 part per million, it would be very RARE in a test that ALL of those 6 significant digits prove useful. In your app, the measurements are presently only approximately correlated in time. And the gap of blind time between measurements will usually represent a much longer period of time than the measurement itself.
Analogy: suppose you had a 100 minute film at 25 frames/sec for a total of 150_000 frames. Now start selecting individual frames that are separated by some random # of frames between about 200 and 500. In the end, you may end up with a sequence of 400 frames in the correct order. Each individual frame is VERY accurate, but the collection of all of them can zip by in 16 seconds and not give you a much understanding about the movie.
What would usually work out much better is to sacrifice some accuracy in order to collect a greater quantity of frames. You trade off the instantaneous accuracy for the overall coherency.
Sorry, got on a roll...   Back to your question. My own preference is almost always to avoid consuming hardware resources when not truly necessary. I've been toying with counters for many years and have still never once deployed an app using a 2-counter frequency measurement. I do the 1-counter measurement and save the other counter(s) for other purposes.
If you've got an M-series board, the 80 MHz timebase allows you to measure a 500 kHz pulsetrain with a quantization error of only about 0.06% (1 part in 160). There's a pretty fair chance that whatever physical process emits that pulsetrain isn't appreciably more stable than that
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tony.harrison wrote:
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Channel 2,3,4,5,6,7 acquire digital signals.
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