window-functions

I have a table with the following data: dt device id count 2018-10-05 computer 7541185957382 6 2018-10-20 computer 7541185957382 3 2018-10-14 computer 7553187775734 6 2018-10-17 computer 7553187775734 10 2018-10-21 computer 7553187775734 2 2018-10-22 computer 7549187067178 5 2018-10-20 computer 7553187757256 3 2018-10-11 computer 7549187067178 10 I want to get the last and first dt for each id . Hence, I used the window functions first_value and last_value as follows: select id,last_value(dt) over (partition by id order by dt) last_dt from table order by id ; But I am getting this error:

I have a table like below: Region Country Manufacturer Brand Period Spend R1 C1 M1 B1 2016 5 R1 C1 M1 B1 2017 10 R1 C1 M1 B1 2017 20 R1 C1 M1 B2 2016 15 R1 C1 M1 B3 2017 20 R1 C2 M1 B1 2017 5 R1 C2 M2 B4 2017 25 R1 C2 M2 B5 2017 30 R2 C3 M1 B1 2017 35 R2 C3 M2 B4 2017 40 R2 C3 M2 B5 2017 45 I need to find SUM([Spend] over different groups as follow: Total Spend over all the rows in the whole table Total Spend for each Region Total Spend for each Region and Country group Total Spend for each Region, Country and Advertiser group So I wrote this query below: SELECT [Period] ,[Region] ,[Country] ,

I am trying to limit the number of rows per case to only 5 rows. Some cases have only 1 or 2 rows but some have 15 or more. This is an example of a stored procedure that I am using to count the number of rows per case. SELECT ROW_NUMBER() OVER(partition by rce.reportruncaseid ORDER BY rce.Reportruncaseid) AS Row, rce.ReportRunCaseId AS CaseId, YEAR(rce.EcoDate) AS EcoYear FROM PhdRpt.ReportCaseList AS rcl INNER JOIN PhdRpt.RptCaseEco AS rce ON rce.ReportId = rcl.ReportId AND rce.ReportRunCaseId = rcl.ReportRunCaseId GROUP BY rce.ReportId, rce.ReportRunCaseId, YEAR(rce.EcoDate) Order by rce

I would like to fire the query suggested in https://stackoverflow.com/a/3800572/2968357 on a HSQLDB database using select * such as WITH tmpTable AS ( SELECT p.* , ROW_NUMBER() OVER(PARTITION BY p.groupColumn order by p.groupColumn desc) AS rowCount FROM sourceTable p) SELECT * FROM tmpTable WHERE tmpTable.rowCount = 1 but getting the following error: Caused by: org.hsqldb.HsqlException: unexpected token: PARTITION required: ) meaning PARTITION BY is not supported. Is there a work-around for my specific query on HSQLDB? The second query in that answer is supported by HSQLDB. If you use the

I was using this SQL statement: SELECT "dateId", "userId", "Salary" FROM ( SELECT *, (row_number() OVER (ORDER BY "userId", "dateId"))%2 AS rn FROM user_table ) sa WHERE sa.rn=1 AND "userId" = 789 AND "Salary" > 0; But every time the table gets new rows the result of the query is different. Am I missing something? Assuming that ("dateId", "userId") is unique and new rows always have a bigger (later) dateId . After some comments: What I think you need: SELECT "dateId", "userId", "Salary" FROM ( SELECT "dateId", "userId", "Salary" ,(row_number() OVER ( PARTITION BY "userId" -- either this ORDER

On the left panel data without IGNORE NULLS. On the right panel data with IGNORE NULLS. So I need to get right variant in PostgreSQL Need to emulate Oracle IGNORE NULLS in window functions (LEAD and LAG) in PostgreSQL. SELECT empno, ename, orig_salary, LAG(orig_salary, 1, 0) IGNORE NULLS OVER (ORDER BY orig_salary) AS sal_prev FROM tbl_lead; If there are NULL, it should return the latest not null value. I've tried it via PostgreSQL user defined aggregate functions, but it's rather hard to understand methodology of it https://www.postgresql.org/docs/9.6/static/sql-createaggregate.html The