group-by

问题 This question already has answers here : Aggregate / summarize multiple variables per group (e.g. sum, mean) (6 answers) Closed 11 months ago . I would like to have a new column with Ntile but it should depend on column 1 - "year" and show the ntile number for column 2 - "mileage". year mileage <dbl> <dbl> 1 2011 7413 2 2011 10926 3 2011 7351 4 2011 11613 5 2012 8367 6 2010 25125 mydata$Ntile <- ntile(mydata$mileage, 10) I know the easy to use function ntile , but I do not know how to make it

问题 I have the following data: +---------+----------+----------+--------+ | id | someId | number | data | +---------+----------+----------+--------+ | 27 | 123 | 1 | abcde1 | | 28 | 123 | 3 | abcde2 | | 29 | 123 | 1 | abcde3 | | 30 | 123 | 5 | abcde4 | | 31 | 124 | 4 | abcde1 | | 32 | 124 | 8 | abcde2 | | 33 | 124 | 1 | abcde3 | | 34 | 124 | 2 | abcde4 | | 35 | 123 | 16 | abcde1 | | 245 | 123 | 3 | abcde2 | | 250 | 125 | 0 | abcde3 | | 251 | 125 | 1 | abcde4 | | 252 | 125 | 7 | abcde1 | | 264 |

问题 Can anyone tell me how to show SSRS group header and footer in SSRS 2008R2? The idea is to have an approach like in Crystal Reports, where we can add a group header/footer and do our own design in that section on every page based on page break functionality. Does anyone know an approach for this in SSRS? I should be able to show my own design/controls/dataset fields group header area, and be able to see it on every page based on the page break by group. Would also appreciate if you can share

问题 I need to be able to order my output data in a proper way using MySQL . I'm using ORDER BY so far and everything was working correctly until now. Let's say I have something like this: Table VEHICLES : ID | Name | MainGroup | SubGroup 1 | A | Vehicle | Truck 2 | B | Vehicle | Car 3 | C | Vehicle | Car 4 | D | Vehicle | Truck 5 | E | Vehicle | Truck 6 | F | Vehicle | Motorbike I was using this: SELECT * FROM Vehicles WHERE MainGroup=Vehicle ORDER BY Subgroup; When I get selections they are not

问题 I have a query like: SELECT * FROM table GROUP BY sid ORDER BY datestart desc LIMIT 10 which returns the last 10 sid groups. For each of these groups, I need the title column of the row with the lowest datestart value I tried using SELECT *, min(datestart) but that didn't return the row with the smallest datestart value, just the lowest datestart. I need the title from the lowest datestart. (Relevant) Table Structure: CREATE TABLE `table` ( `title` varchar(1000) NOT NULL, `datestart`

问题 I have a table with: Id (id of rider) Time (is the time that he has done) Session (number session where the time was done) idlap idRider session time 1 45652 1 4 2 54645 1 2 3 45652 2 2 4 54582 2 1 5 51284 1 3 6 54582 1 3 7 54645 2 4 8 51284 2 5 9 54582 2 2 I wonder how to query in mysql a result like: idRider |fast sesion | count laps 45652 | 2 | 1 54645 | 1 | 1 51284 | 3 | 1 54582 | 2 | 2 The query should return in wich session the rider got the best time(fast session) and count the number

问题 I have two tables, event and version. An event has many versions. I want to perform an inner join and get THE LAST version for each event. QUERY SELECT * FROM events.event e INNER JOIN events.version v ON (e.version_id = v.id) GROUP BY e.event_id TABLE EVENT id event_id version_id updated 1 1 7 03/08/2018 2 2 8 06/06/2018 3 2 9 02/07/2018 TABLE VERSION id name description comments 7 Dinner A fancy dinner Z Comment Z 8 Breakfast Fancy breakfast Y Comment Y 9 Breakfast Fancy breakfast X Comment

问题 I have the following scenario of the number of people and the type entering the premises, rounded to an hour. Date-time Type 2014-01-01 01:00:00 Employee 2014-01-01 01:00:00 Visitor 2014-01-01 01:00:00 Employee 2014-01-01 02:00:00 Visitor 2014-01-01 02:00:00 Visitor 2014-01-01 02:00:00 Visitor 2014-01-01 02:00:00 Employee 2014-01-01 03:00:00 Employee 2014-01-01 03:00:00 Visitor 2014-01-01 03:00:00 Employee I am doing a query to group them together select count(*), HOUR(Date-Time), Type from

问题 I am trying to calculate the running total of loss by the months on Impala using TOAD The following query is throwing the error - select list expression not produced by aggregation output (missing from group by clause ) select segment, year(open_dt) as open_year, months, sum(balance) sum(loss) over (PARTITION by segment,year(open_dt) order by months) as NCL from tableperf where year(open_dt) between 2015 and 2018 group by 1,2,3 回答1: You are mixing aggregation and window functions. I think you

问题 Input Date Points Email 2012-07-01 5 a@sample.com 2012-07-01 6 b@sample.com 2012-07-01 2 c@sample.com 2012-07-02 5 d@sample.com 2012-07-03 8 e@sample.com 2012-07-03 7 f@sample.com 2012-07-03 1 y@sample.com 2012-07-04 3 x@sample.com 2012-07-04 2 f@sample.com 2012-07-05 3 g@sample.com 2012-07-05 9 b@sample.com Output Date Points 2012-07-01 13 2012-07-02 5 2012-07-03 16 2012-07-04 5 2012-07-05 12 Suggest me an MySQL Query for output like the above 回答1: try SELECT `date`, SUM(`Points`) AS