## Maximum time period

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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.

See above.

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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• 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 `Q`. Ex: `2019Q1` or `2019-Q1`. Though not defined in the ISO 8601, the latter style follows the conventions of that standard.
• @dbwhite64: That's a typo. Make it `desc` for "descending". (You could also remove it completely for ascending order and change `first` to `last` instead .)