I have no prior knowledge, and need help in solving this problem where I have to arrange, times :- hour and minute, to its respective column.
Sample_Here
What you are looking for is the hour() and minute() functions. You have no past knowledge... but if you couldn't find this answer on your own, perhaps you should take a course in Excel?
Related
this is my very first question on Stackoverflow!
I have a database with a datetime PK, the entries are each hour of each day for a whole year, so there should be 8760 entries per year. Now my task is to check if there is indeed 24 entries for each hour of each day for the whole year.
My first idea for handling this problem would be to query each unique day, and return a match if there isent 24 matches of a specific date.
But i am quite unsure of how i should write they SQL, what kind of tools should i use, and is this a good idea to go about it?
Thank you for reading and please ask if you want me to elaborate :)
I'm having trouble getting the results I would like from the query I've built. The overall goal I'm trying to accomplish is to get the first odometer reading of the month and the last odometer reading of the month for a specific vehicle. I would then like to subtract the two to get total miles driven for that month. I figured a derived table with window functions would best help to accomplish this goal (see example SQL below).
SELECT
VEHICLE_ID2_FW
FROM
(SELECT
VEHICLE_ID2_FW,
LOCATION_CODE_FW,
MIN(ODOMETER_FW) OVER(PARTITION BY YEAR(DATE_FW), MONTH(DATE_FW)) AS MIN_ODO,
MAX(ODOMETER_FW) OVER(PARTITION BY YEAR(DATE_FW), MONTH(DATE_FW)) AS MAX_ODO
FROM
GPS_TRIPS_FW) AS G
I keep running into an issue where the derived table's query, by itself, runs and
works. However, when I bracket it in the FROM clause it shoots back an the error
The multi-part identifier could not be bound
Hoping that I could get some help figuring this out and maybe finding an overall better way to accomplish my goal. Thank you!
Odometers only increase (well, that should be true). So just use aggregation:
select VEHICLE_ID2_FW, year(date_fw), month(date_fw),
min(ODOMETER_FW), max(ODOMETER_FW),
max(ODOMETER_FW) - min(ODOMETER_FW) as miles_driven_in_month
from GPS_TRIPS_FW
group by VEHICLE_ID2_FW, year(date_fw), month(date_fw);
This answers the question that you asked. I don't think it solves your problem, though, because the total miles driven per month will not add up to the total miles driven. The issue are the miles driven between the last record at the end of the month and the first at the beginning of the next month.
If this is an issue, ask another question. Provide sample data, desired results, and an appropriate database tag.
I'm trying to convert the Optaplanner ProjectJobScheduling Dates to LocalDateDime, but I'm facing problems in score calculations. The scores are calculated based on the resources business calendar minutes duration between two dates.
In the ProjectJobSchedulingIncrementalScoreCalculator.java I have the soft1Score initial set based in only one date. What should I do, is it feasable?
Can someone provide me any samples with real dates?
Regards
Look at the optaplanner-examples NurseRostering and ConferenceScheduling (new in 7.6).
Basically, do a find in path for "java.time".
I'm new to Pig. I need to do some calculation for all fields/columns in a table. However, I can't find a way to do it by searching online. It would be great if someone here can give some help!
For example: I have a table with 100 fields/columns, most of them are numeric. I need to find the average of each field/column, is there an elegant way to do it without repeat AVERAGE(column_xxx) for 100 times?
If there's just one or two columns, then I can do
B = group A by ALL;
C = foreach B generate AVERAGE(column_1), AVERAGE(columkn_2);
However, if there's 100 fields, it's really tedious to repeatedly write AVERAGE for 100 times and it's easy to have errors.
One way I can think of is embed Pig in Python and use Python to generate a string like that and put into compile. However, that still sounds weird even if it works.
Thank you in advance for help!
I don't think there is a nice way to do this with pig. However, this should work well enough and can be done in 5 minutes:
Describe the table (or alias) in question
Copy the output, and reorgaize it manually into the script part you need (for example with excel)
Finish and store the script
If you need to be able with columns that can suddenly change etc. there is probably no good way to do it in pig. Perhaps you could read it in all columns (in R for example) and do your operation there.
I'm trying to write a query for searching hotel rooms.
I get check in date and day of staying nights from user.
I have written a while loop for staying nights. So it adds one day to check in date in while loop. Is this the good way or you guys have any different ideas?
Thanks...
Happy coding
Most (if not all) SQL databases perform much better with set operations than with while loops. A better approach for your case (which is quite vague) would be to search for rooms that have availability on all dates between {check-in date} and {check-in date + (nights-1)}