When trying to manipulate and display date from ONE table, I am having difficulty coding it correctly.
I need to, from the same table, find the amount of Services done per day (Which has been done, based on the Count of ServiceId). I then need to find the OverallCharge (done) and find the min, max and avg of these overallCharge (s) per day (BasicCharge + AdditionalPartsCharge + AdditionalLabourCharge)
I need to display these charges per ServiceDate in the table
My draft is the following but is telling me that ServiceId is not part of an aggregate function.
SELECT Service.ServiceDate, Service.NumServices , Min(OverallCharge) AS MinOverallCharge, Max(OverallCharge) AS MaxOverallCharge, Avg(OverallCharge) AS AverageOverallCharge
FROM (SELECT Service.ServiceId, Sum([BasicCharges]+[AdditionalLabourCharges]+[AdditionalPartCharges]) AS OverallCharge, Service.ServiceDate, Count (Service.ServiceId) AS NumServices
FROM Service
GROUP BY Service.ServiceDate, NumServices, MinOverallCharge, MaxOverallCharge, AvgerageOverallCharge);
Thanks
Related
I'm pretty new to SQL and I'm struggling with one of the questions on my exercise. How would I calculate average session length per daily active user? The table shown is just a sample of what the extended table is. Imagine loads more rows.
I simply used this query to calculate the daily active users:
SELECT COUNT (DISTINCT user_id)
FROM table1
and welcome to StackOverflow!
now, your question:
How would I calculate average session length per daily active user?
you already have the session time, and using AVG function you will get a simple average for all
select AVG(session_length_seconds) avg from table_1
but you want per day... so you need to think as group by day, so how do you get the day? you have a activity_date as a Date entry, it's easy to extract day, month and year from it, for example
select
DAY(activity_date) day,
MONTH((activity_date) month,
YEAR(activity_date) year
from
table_1
will break down the date field in columns you can use...
now, back to your question, it states daily active user, but all you have is sessions, a user could have multiple sessions, so I have no idea, from the context you have shared, how you go about that, and make the avg for each session, makes no sense as data to retrieve, I'll just assume, and serves this answer just to get you started, that you want the avg per day only
knowing how to get the average, let's create a query that has it all together:
select
DAY(activity_date) day,
MONTH((activity_date) month,
YEAR(activity_date) year,
AVG(session_length_seconds) avg
from
table_1
group by
DAY(activity_date),
MONTH((activity_date),
YEAR(activity_date)
will output the average of session_length_seconds per day/month/year
the group by part, you need to have as many fields you have in the select but that do not do any calculation, like sum, count, etc... in our case avg does calculation, so we don't want to group by that value, but we do want to group by the other 3 values, so we have a 3 columns with day, month and year. You can also use concat to join day, month and year into just one string if you prefer...
Im trying to average the past 5 rows in my table i created in SSRS grouped by date(Monday of every week). Ive tried runningValue however it looks back at all the past rows for each group. Is there a way to limit the scope to just the past 5 rows or weeks for each Date group.
Thanks
I would accomplish this with grouping. I don't know what your dataset is like but I assume it is a SQL query you can modify. The easiest solution would be to add a week number column to your query. For example:
SELECT datepart(week, YOURDATE) as WeekNumber
More info on datepart:
https://learn.microsoft.com/en-us/sql/t-sql/functions/datepart-transact-sql?view=sql-server-2017
Once you have a week number, use the table creation wizard in Report Builder and add WeekNumber as a row group. This will group your values by week number and give you a total under each week. You can change the total by double clicking and making it AVG() instead of SUM().
Note: If you already have each 5 day period in a group, you should be able to right click that and add total. At which point you can just change the SUM to AVG there.
I have a table of travel expenses for analysis.
I would like to create a calculated column with a value for the maximum count of records with a certain category for each employee on any given day.
For example, if the category being reviewed is "dinner", we would like to know what is the maximum number of dinner transactions charged on any given day.
The following custom expression was able to count how many dinner expenses per employee:
count(If([Expense Type]="Dinner",[Expense Type],null)) over ([Employee])
But when trying to get the max count over days, I cant seem to get it to work. Here is the expression used:
Max(count(If([Expense Type]="Dinner",[Expense Type],null)) over ([Employee])) over (Intersect([Employee],[Transaction Date]))
This seems to provide the same answer as the first expression. Any idea on how to get this code to identify the value on the date with the most expenses for each employee?
If i understand your question and comments correctly, you should be able to use intersect.
count(If([Expense Type]="Dinner",[Expense Type],null)) over (Intersect([Transaction Date],[Employee]))
You may need to cast [Transaction Date] as a date if it is an actual DateTime. Otherwise you'd get one for each unique DT.
For the purposes of my question, I have a database in a MySQL server with info on many taxi rides (it is comprised of two tables, history_trips and trip_info).
In history_trips, each row's useful data is comprised of a unique alphanumeric ID, ride_id, the name of the rider, rider, and the time the ride ended, finishTime as a Y-m-d string.
In trip_info, each row's useful data similarly contains ride_id and rider, but also contains an integer, value (calculated in the back end from other data).
What I need to do is create a query that can find the average of all the maximum 'values' from all riders in a given time period. The riders included in this average are only considered if they completed less than X (let's say 3) rides within the aforementioned time period.
So far, I have a query that creates a grouped table containing the name of the rider, the finishTime of their highest 'value' ride, the value of said ride, and the number of rides, num_rides, they have taken in that time period. The AVG(b.value) column, however, gives me the same values as b.value, which is unexpected. I would like to find some way to return the average of the b.value column.
SELECT a.rider, a.finishTime, b.value, AVG(b.value), COUNT(a.rider) as num_rides
FROM history_trips as a, trip_info as b
WHERE a.finishTime > 'arbitrary_start_date_str' and a.ride_id = b.ride_id
and b.value = (SELECT MAX(value)
from trip_info where rider = b.rider and ride_id = b.ride_id)
GROUP BY a.rider
HAVING COUNT(a.rider) < 3
I am a novice in SQL but have read on some other forums that when using the AVG function on a value you must also GROUP BY that value. I was wondering if there is a way around that or if I am thinking of this problem incorrectly. Thanks in advance for any advice / solutions you might have!
The following worked for me:
SELECT AVG(ridergroups.maxvalues) avgmaxvalues FROM
(SELECT MAX(trip_info.value) maxvalues FROM trip_info
INNER JOIN history_trips
ON trip_info.rideid = history_trips.ride_id
WHERE history_trips.finishTime > '2010-06-20'
GROUP BY trip_info.rider
HAVING COUNT(trip_info.rider) < 3) ridergroups;
The subquery groups the maximum values by rider after filtering by date and rider count. The containing query calculates the average of the maximum values.
I am trying to write a single MySQL query which will tell me the total number of active users in the database in week-based intervals. The 2 returned values per row should be the date, and the total number of active users on that date. I was able to get this far:
SELECT from_days(to_days(cast(u.created as datetime)) - mod(to_days(cast(u.created as datetime)) - 1 - 1, 7)) AS date, COUNT(1) as count
FROM users u
WHERE u.active = 1
GROUP BY 1;
I believe this shows me the number of new active users in each given interval, but I can't figure out how to 'aggregate' those counts to show the total number of users increasing over each time interval. Any point in the right direction would be greatly appreciated.
It's hard to say without an example of your output but I would start by making the whole thing a subquery and using an aggregate function or a calculation on top of it.
See this post:
MySQL Running Total with COUNT