Please advice how to combine query, to find first occurrence of row
I have table
Date Counter
01.01.2005 208,5
02.01.2005 209,5 <----- start
03.01.2005 210,5
04.01.2005 211,5
08.01.2005 16,5
09.01.2005 17,2
10.01.2005 18,8 <------ correct
11.01.2005 19,7
12.01.2005 20,7
13.01.2005 21
14.01.2005 116,3
15.01.2005 120,4
16.01.2005 135,2
17.01.2005 1,1
18.01.2005 10,3
19.01.2005 18,7 <------ wrong
20.01.2005 14,2
21.01.2005 8,5
22.01.2005 7,1
and I need to extract Date by Counter 18.5 (from starting date 02.01.2005), since this value not in the table possible to take next higher value.
I tried to search by using starting date (because table have thousand dates and Counter between 0-499) and limit for value (grater or equal).
select top 1 Date from Tabel1 where Date > 02.01.2005 AND Counter >= 18.5
this query return wrong result - date 03.01.2005,
but correct must be 10.01.2005.
Hope for any assistance. Thanks in advance.
(I use: sql 2008 r).
You need to put an ORDER BY clause when using TOP. In this case you want to get the lowest Counter:
SELECT TOP 1 *
FROM tbl
WHERE
Date > CAST('20050102' AS DATE)
AND Counter >= 18.5
ORDER BY Counter
Note that without the ORDER BY, the result of TOP 1 is not guaranteed to always be the same.
Related
I have got 4 tables in BigQuery that keep statistics for messages in a Message Queue. The tables are : receivedMessages, processedMessages, skippedMessages and failedMessages. Each table has among other things a header.processingMetadata.approximateArrivalTimestamp which as you might have guessed it is a timestamp field.
My purpose is to create 4 charts for each one of this tables aggregating in this field as well as a 5th chart that displays the percentage of each message category each day in regards to the receivedMessages as well as the unknown status messages using the following formula :
UNKNOWN_STATUS_MESSAGES = TOTAL_RECEIVED_MESSAGES - (TOTAL_PROCESSED_MESSAGES + TOTAL_SKIPPED_MESSAGES + TOTAL_FAILED_MESSAGES)
However some days do not have skipped or failed messages, therefore there are no records in Big Query in these two tables. This results to these 2 graphics having dates missing and also not displaying correctly the UNKNOWN_STATUS_MESSAGES in the 5th graph.
I also used the following code as a metric in my graphs with no success (changing the variable name appropriately each time).
CASE WHEN TOTAL_FAILED_MESSAGES IS NULL THEN 0 ELSE TOTAL_FAILED_MESSAGES END
Is there a way to make google data studio to fill the dates with no data with 0s so I can display the charts correctly?
As long as you know the date boundaries of your chart, you can fill those holes with zeros. For instance, if you want to generate your report for last 30 days:
with dates as (
select
x as date
from
unnest(generate_date_array(date_sub(current_date(), interval 30 day), current_date())) as x
)
select
date,
received_messages,
processed_messages,
skipped_messages,
failed_messages,
received_messages - (processed_messages + skipped_messages + failed_messages) as unknown_messages from (
select
d.date,
coalesce(count(received.*), 0) as received_messages,
coalesce(count(processed.*), 0) as processed_messages,
coalesce(count(skipped.*), 0) as skipped_messages,
coalesce(count(failed.*), 0) as failed_messages
from dates d
left join dataset.receivedMessages received
on date(received.header.processingMetadata.approximateArrivalTimestamp) = d.date
left join dataset.processedMessages processed
on date(processed.header.processingMetadata.approximateArrivalTimestamp) = d.date
left join dataset.skippedMessages skipped
on date(skipped.header.processingMetadata.approximateArrivalTimestamp) = d.date
left join dataset.failedMessages failed
on date(failed.header.processingMetadata.approximateArrivalTimestamp) = d.date
group by 1
)
order by 1
1) I recommend doing a join in BigQuery with a date master table to return '0' for those date values.
2) Otherwise, in Data Studio, make sure there is a field X that has values for all dates. Then create a calculated field with formula X - X + TOTAL_SKIPPED_MESSAGES and X - X + TOTAL_FAILED_MESSAGES
As I found out it is also possible to do it in non fixed date using date parameters. So the first part of khan's answer can be rewritten as:
WITH dates AS (
select *
from unnest(generate_date_array(PARSE_DATE('%Y%m%d', #DS_START_DATE), PARSE_DATE('%Y%m%d', #DS_END_DATE), interval 1 day)) as day
)
I have records in database with start and end dates
i want to filter out all records with are in range of start and end date
i have two query that works , gives me records between two dates and the other query gives me records that are in range of start or end date
how do i combine these two linq query into single one so it works in both ways
Linq 1
schedulelist = (From c In db.Table1 Where c.StartDate.Value.Date <= objStartDate.Date And c.EndDate.Value.Date >= objStartDate.Date And
c.UserID = CInt(Session("UserID"))).ToList()
Linq 2
schedulelist = (From c In db.Table1 Where (c.StartDate.Value.Date >=
objStartDate.Date And c.StartDate.Value.Date <= objEndDate.Date) Or
(c.EndDate.Value.Date >= objStartDate.Date And c.EndDate.Value.Date <=
objEndDate.Date) And c.UserID = CInt(Session("UserID"))).ToList()
in db table have these values
StartDate EndDate
2019-10-08 07:00:00.000 2019-10-30 07:00:00.000
2019-10-15 07:00:00.000 2019-10-27 07:00:00.000
if search with ObjStartDate 15/10/2019 00:00:00 and ObjEndDate 27/10/2019 00:00:00
i get record No 2 when i run Linq 2
i get Record No 1 when i run Linq 1
what i should get is both records for any Linq 1 or Linq 2
so whats the better solution to combine both into one query or this query is all wrong ?
The simplest query to check if date range 1 intersects date range 2 is this:
... WHERE range2_end > range1_start
AND range1_end > range2_start
This checks all cases such as range 1 fully inside, fully contains, starts inside or ends inside range 2.
I need to update the highvaluesegment when new higher current value segment occurs else retain the lasthighestvalue attained.
In given day when currentvalue decreases
for eg: 4 to 2 then Highestsegmentvalue = 4 and currentvaluesegment = 2
Expected output:
Assuming SQL Server, you can use the window functions
Example
Select DateKey
,CurrentSegmentRank
,highestValueSegment = max(CurrentSegmentRank) over (Order By DateKey)
From YourTable
Order By DateKey
I have a table with call logs. I need to assign time slots for next call based on which time slot the phone number was reachable in.
The relevant columns of the table are:
Phone Number | CallTimeStamp
CallTimeStamp is a datetime object.
I need to calculate the following:
Time Slot: From the TimeStamp, I need to calculate the count for each time slot (eg. 0800-1000, 1001-1200, etc.) for each phone number. Now, if the count is greater than 'n' for a particular time slot, then I need to assign that time slot to that number. Otherwise, I select a default time slot.
Weekday Slot: Same as above, but with weekdays.
Priority: Basically a count of how many times a number was reached
Here's I have gone about solving these issues:
Priority
To calculate the number of times a phone number is called is straight forward. If a number exists in the call log, I know that it was called. In that case, the following query will give me the call count for each number.
SELECT DISTINCT(PhoneNumber), COUNT(PhoneNumber) FROM tblCallLog
GROUP BY PhoneNumber
However, my problem is that I need to change the values in the field Count(PhoneNumber) based on the value in that column itself. How do I go about achieving this? (eg. If Count(PhoneNumber) gives me a value > 20, I need to change it to 5).
Time Slot / Weekday
This is where I'm completely stumped and am looking for the "database" way of doing things.
Unfortunately, I can't get out of my iterative process of thinking. For example, if I was aggregating for a certain phone number (say '123456') and in a certain time slot (say between 0800-1000 hrs), I can write a query like this:
DECLARE #T1Start time = '08:00:00.0000'
DECLARE #T2End time = '10:00:00.0000'
SELECT COUNT(CallTimeStamp) FROM tblCallLog
WHERE PhoneNumber = '123456' AND FORMAT(CallTimeStamp, 'hh:mm:ss') >= #T1Start AND FORMAT(CallTimeStamp, 'hh:mm:ss') < #T2End
Now, I could go through each and every Distinct Phone Number in the table, count the values for each time slot and then assign a slot value for the phone number. However, there has to be a way that does not involve me iterating through a database.
So, I am looking for suggestions on how to solve this.
Thanks
You can use DATEPART Function to get week day slot.
To calculate time slot you can try dividing number of minutes from beginning of day and dividing it by size of the time slot. It would return you slot number. You can use either CASE statement to translate it to proper string or look table where you can store slot descriptions.
SELECT
PhoneNumber
, DATEPART(WEEKDAY, l.CallTimeStamp) AS DayOfWeekSlot
, DATEDIFF(MINUTE, CONVERT(DATE, l.CallTimeStamp), l.CallTimeStamp) / 120 AS TwoHourSlot /*You can change number of minutes to get different slot size*/
, COUNT(*) AS Count
FROM tblCallLog l
GROUP BY PhoneNumber
, DATEPART(WEEKDAY, l.CallTimeStamp)
, DATEDIFF(MINUTE, CONVERT(DATE, l.CallTimeStamp), l.CallTimeStamp) / 120
You could try this to return the phone number, the day of the week and a 2 hour slot. If the volume of calls is greater than 20 the value is set to 5 (not sure why to 5?). The code for the 2 hour section is adapted from this question How to Round a Time in T-SQL where the value 2 in (24/2) is the number of hours in your time period.
SELECT
PhoneNumber
, DATENAME(weekday,CallTimeStamp) as [day]
, CONVERT(smalldatetime,ROUND(CAST(CallTimeStamp as float) * (24/2),0)/(24/2)) AS RoundedTime
, CASE WHEN COUNT(*) > 20 THEN 5 ELSE COUNT(*) END
FROM
tblCallLog
GROUP BY
PhoneNumber
, DATENAME(weekday,dateadd(s,start_ts,'01/01/1970'))
I am trying to create a table within a report that appears as follows:
The data set is based on this query:
SELECT
DATENAME(dw, CurrentReadTime) AS 'DAY',
DATEPART(dw, CurrentReadTime) AS 'DOW',
CAST(datename(HH, CurrentReadTime) as int) AS 'HOD',
AVG([Difference]) AS 'AVG'
FROM
Consumption
INNER JOIN Readings ON Readings.[RadioID-Hex] = Consumption.[RadioID-Hex]
WHERE
CONCAT([Building], ' ', [Apt]) = #ServiceLocation
GROUP BY
CurrentReadTime
ORDER BY
DATEPART(DW, CurrentReadTime),
CAST(DATENAME(HH, CurrentReadTime) AS INT)
The data from this table returns as follows:
In report builder, I have added this code to the report properties:
Function GetRangeValueByHour(ByVal Hour As Integer) As String
Select Case Hour
Case 6 To 12
GetRangeValueByHour = "Morning"
Case 12 to 17
GetRangeValueByHour = "Afternoon"
Case 17 to 22
GetRangeValueByHour = "Evening"
Case Else
GetRangeValueByHour = "Overnight"
End Select
Return GetRangeValueByHour
End Function
And this code to the "row group":
=Code.GetRangeValueByHour(Fields!HOD.Value)
When I execute the report, selecting the parameter for the target service location, I get this result:
As you will notice, the "Time of Day" is displaying the first result that meets the CASE expression in the Report Properties code; however, I confirmed that ALL "HOD" (stored as an integer) are being grouped together by doing a SUM on this result.
Furthermore, the actual table values (.05, .08, etc) are only returning the results for the HOD that first meets the requirements of the CASE statement in the VB code.
These are the things I need resolved, but can't figure out:
Why isn't the Report Properties VB code displaying "Morning", "Afternoon", "Evening", and "Overnight" in the Time of Day column?
How do I group together the values in the table? So that the AVG would actually be the sum of each AVG for all hours within the designated range and day of week (6-12, 12-18, etc on Monday, Tuesday etc).
To those still reading, thanks for your assistance! Please let me know if you need additional information.
I'm still not sure if I have a clear picture of your table design, but I'm imagining this as a single row group that's grouped on this expression: =Code.GetRangeValueByHour(Fields!HOD.Value). Based on this design and the dataset above, here's how I would solve your two questions:
Use the grouping expression for the value of the Time of Day cell, like:
Add a SUM with a conditional for the values on each day of the week. Example: the expression for Sunday would be =SUM(IIF(Fields!DOW.Value = 1, Fields!AVG.Value, CDec(0))). This uses CDec(0)instead of 0 because the AVG values are decimals and SSRS will otherwise throw an aggregate of mixed data types error by interpreting 0 as an int.