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I have a dataset that lists ID's (EmployeeID), the time period in quarters and years, four digit code, last two numbers of year are first 2 numbers, quarter number is second two. Quarter 1 of 2013 would be '1301' (Quarter) It includes active and previous employees. It also has sales (Sales). The dataset has one row per ID, per quarter. I need sales at the most recent quarter.
here is my code:
select EmployeeID, max(Quarter), Sales from dataset;
Clearly this is wrong because it wants me to group by employeeid and sales etc and it gives me multiple rows for each employeeid.
I need output of 1 row per EmployeeID giving me their most recent quarter and sales during that quarter.
All sales from the last quarter:
select * from dataset where quarter = (select max(quarter) from dataset);
All sales an employee did last (i.e. last quarter per employee = different last quarters):
select * from dataset where (employeeid, quarter) in ( select employeeid, max(quarter) from dataset group by employeeid );
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Without using window functions, you can create a derived table with one record for each employee and the max quarter, then inner join that back on the datset.
;WITH MaxQuarter AS(select EmployeeID, MaxQuarter = max(Quarter) from dataset) select EmployeeID, Quarter, Sales from dataset ds inner join MaxQuarter m on m.EmployeeID = ds.EmployeeID and m.MaxQuarter = ds.Quarter
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In case you're using SQL Server you can use a common table expression
WITH MaxQuarters(EmployeeID, MaxQuarter) AS ( SELECT EmployeeID, MAX(Quarter) as MaxQuarter FROM dataset GROUP BY EmployeeID ) SELECT EmployeeID, Quarter, Sales FROM dataset ds JOIN MaxQuarters mq on ds.EmployeeID = mq.EmployeeID
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If you want the most recent quarter overall:
select ds.* from dataset ds where ds.quarter = (select max(ds2.quarter) from dataset ds2);
If you want the maximum per employee:
select ds.* from dataset ds where ds.quarter = (select max(ds2.quarter) from dataset ds2 where ds2.employeeid = ds.employeeid );
Or, in Oracle, you can use
keep and aggregation:
select employeeid, max(quarter), max(sales) keep (dense_rank first order by quarter desc) as sales from dataset group by employeeid
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- Share sample input and desired output data
- What rdbms are you using?
- oracle sql, sorry.
- @dbwhite64 Post clarifications as edits to your Question rather than as Comments.
- FYI, more commonly, quarters are represented with a 4-digit year, a
Q, and a one-digit number. Some might put a hyphen between year and
2019-Q1. Though not defined in the ISO 8601, the latter style follows the conventions of that standard.
- Your second block worked perfectly!! Thank you!!
- I appreciate the time. The oracle version gave me a "missing right parenthesis" error after "dec)" in line 2. Any suggestions?
- @dbwhite64: That's a typo. Make it
descfor "descending". (You could also remove it completely for ascending order and change