I have some data that look like this:
table
I would like to get, by term, the most recent upload date
I've tried this but I know I have placed the term parameters in the wrong place because I only got the max date of the whole group instead of max date within both the 1 term and the 4 term.
SELECT Inst, Term, Year, FreezeDate, UploadDate, RecordCount, ErrorCount, FileName, System,
FROM table
WHERE UploadDate=(
SELECT MAX(UploadDate) FROM table WHERE System = ('a') and Year = ('2017') and Inst = ('123') and (Term = ('1') or Term = ('4')))
My ideal output would be this:
Could someone assist?
Create a subquery grouped by term and with max upload date, then join on your table
SELECT t.*
FROM table t
JOIN (SELECT Term, MAX(UploadDate) as MaxUploadDate FROM table GROUP BY Term) tmud
ON t.term = tmud.term AND t.UploadDate = tmud.MaxUploadDate
Related
I want a query that returns a record set of the shaded rows from the table above for each unique case_id by the latest data_level_assinged value. I tried something like this:
SELECT case_id, level, date_level_assigned
FROM table
SORT BY case_id, date_level_assigned DESC;
From reading it looks like I need to use an aggregate function like MAX(data_level_assinged) but am not sure how to do this.
You're almost there.
Using MAX is a good approach.
SELECT b.case_id, a.level, b.date_level_assigned FROM tablename a
JOIN
( SELECT MAX(date_level_assigned) as date_level_assigned, case_id
FROM tablename
GROUP BY case_id
) as b
ON a.case_id = b.case_id AND a.date_level_assigned = b.date_level_assigned
You can do it in this way
I have run into an issue I don't know how to solve. I'm working with a MS Access DB.
I have this data:
I want to write a SELECT statement, that gives the following result:
For each combination of Project and Invoice, I want to return the record containing the maximum date, conditional on all records for that combination of Project and Invoice being Signed (i.e. Signed or Date column not empty).
In my head, first I would sort the irrelevant records out, and then return the max date for the remaining records. I'm stuck on the first part.
Could anyone point me in the right direction?
Thanks,
Hulu
Start with an initial query which fetches the combinations of Project, Invoice, Date from the rows you want returned by your final query.
SELECT
y0.Project,
y0.Invoice,
Max(y0.Date) AS MaxOfDate
FROM YourTable AS y0
GROUP BY y0.Project, y0.Invoice
HAVING Sum(IIf(y0.Signed Is Null,1,0))=0;
The HAVING clause discards any Project/Invoice groups which include a row with a Null in the Signed column.
If you save that query as qryTargetRows, you can then join it back to your original table to select the matching rows.
SELECT
y1.Project,
y1.Invoice,
y1.Desc,
y1.Value,
y1.Signed,
y1.Date
FROM
YourTable AS y1
INNER JOIN qryTargetRows AS sub
ON (y1.Project = sub.Project)
AND (y1.Invoice = sub.Invoice)
AND (y1.Date = sub.MaxOfDate);
Or you can do it without the saved query by directly including its SQL as a subquery.
SELECT
y1.Project,
y1.Invoice,
y1.Desc,
y1.Value,
y1.Signed,
y1.Date
FROM
YourTable AS y1
INNER JOIN
(
SELECT y0.Project, y0.Invoice, Max(y0.Date) AS MaxOfDate
FROM YourTable AS y0
GROUP BY y0.Project, y0.Invoice
HAVING Sum(IIf(y0.Signed Is Null,1,0))=0
) AS sub
ON (y1.Project = sub.Project)
AND (y1.Invoice = sub.Invoice)
AND (y1.Date = sub.MaxOfDate);
Write A SQL query, which should be possible in MS-Access too, like this:
SELECT
Project,
Invoice,
MIN([Desc]) Descriptions,
SUM(Value) Value,
MIN(Signed) Signed,
MAX([Date]) "Date"
FROM data
WHERE Signed<>'' AND [Date]<>''
GROUP BY
Project,
Invoice
output:
Project
Invoice
Descriptions
Value
Signed
Date
A
1
Ball
100
J.D.
2022-09-20
B
1
Sofa
300
J.D.
2022-09-22
B
2
Desk
100
J.D.
2022-09-23
Note: for invoice 1 on project A, you will see a value of 300, which is the total for that invoice (when grouping on Project='A' and Invoice=1).
Maybe I should have used DCONCAT (see: Concatenation in between records in Access Query ) for the Description, to include 'TV' in it. But I am unable to test that so I am only referring to this answer.
Try joining a second query:
Select *
From YourTable As T
Inner Join
(Select Project, Invoice, Max([Date]) As MaxDate
From YourTable
Group By Project, Invoice) As S
On T.Project = S.Project And T.Invoice = S.Invoice And T.Date = S.MaxDate
Suppose I have a table, TeamRatings, that looks something like this
|---Team----|--ValuationDate--|-Rating-|
|--Saints---|---10/15/2012----|---81.1-|
|--Broncos--|---10/15/2012----|---91.1-|
|--Ravens---|---10/16/2012----|--101.1-|
|--Broncos--|---10/22/2012----|---82.1-|
|--Ravens---|---10/22/2012----|---83.1-|
|--Saints---|---10/29/2012----|---84.1-|
|--Broncos--|---10/28/2012----|---85.1-|
|--Ravens---|---10/29/2012----|---86.1-|
Also, it is assumed that a team's rating remains unchanged until they play a new game, (representing a new record). E.g. The Broncos' rating on date 10/21/2012 is assumed to be 102.8
I want a query with a date parameter, that will return one record per team represnting that team's most recent game prior to the date specified. For instance,
If I input 10/23/2012 as my date parameter, the query should return
|---Team---|-ValuationDate---|-Rating-|
|--Saints--|---10/15/2012----|---81.1-|
|--Broncos-|---10/22/2012----|---82.1-|
|--Ravens--|---10/22/2012----|---83.1-|
Any help is greatly appreciated. Thanks!
On MS SQL Server 2005 or greater you can use a cte with ROW_NUMBER function:
WITH x
AS (SELECT team,
valuationdate,
rating,
rn = Row_number()
OVER(
partition BY team
ORDER BY valuationdate DESC)
FROM teamratings
WHERE valuationdate < #DateParam)
SELECT team,
valuationdate,
rating
FROM x
WHERE rn = 1
You can use a more general query like this:
select Team, x.ValuationDate, Rating
from TeamRatings inner join
(
select Team, max(ValuationDate) as ValuationDate
from TeamRatings
where ValuationDate < #dateParameter
group by Team
) x on TeamRatings.Team = x.Team and TeamRatings.ValuationDate = x.ValuationDate
I am new to sql queries.
Table is defined as
( symbol varchar,
high int,
low int,
today date,
Primary key (symbol, today)
)
I need to find for each symbol in a given date range, max(high) and min(low) and corresponding dates for max(high) and min(low).
Okay to get first max date and min date in given table.
In a given date range some dates may be missing. If start date is not present then next date should be used and if last date is not present then earlier available date should be used
Data is for one year and around 5000 symbols.
I tried something like this
SELECT a.symbol,
a.maxValue,
a.maxdate,
b.minValue,
b.mindate
FROM (
SELECT table1.symbol, max_a.maxValue, max_a.maxdate
FROM table1
INNER JOIN (
SELECT table1.symbol,
max(table1.high) AS maxValue,
table1.TODAY AS maxdate
FROM table1
GROUP BY table1.symbol
) AS max_a
ON max_a.symbol = table1.symbol
AND table1.today = max_a.maxdate
) AS a
INNER JOIN (
SELECT symbol,
min_b.minValue,
min_b.mindate
FROM table1
INNER JOIN (
SELECT symbol,
min(low) AS minValue,
table1.TODAY AS mindate
FROM table1
GROUP BY testnsebav.symbol
) AS min_b
ON min_b.symbol = table1.symbol
AND table1.today = min_b.mindate
) AS b
ON a.symbol = b.symbol
The first INNER query pre-qualifies for each symbol what the low and high values are within the date range provided. After that, it joins back to the original table again (for same date range criteria), but also adds the qualifier that EITHER the low OR the high matches the MIN() or MAX() from the PreQuery. If so, allows it in the result set.
Now, the result columns. Not knowing which version SQL you were using, I have the first 3 columns as the "Final" values. The following 3 columns after that come from the record that qualified by EITHER of the qualifiers. As stocks go up and down all the time, its possible for the high and/or low values to occur more than once within the same time period. This will include ALL those entries that qualify the MIN() / MAX() criteria.
select
PreQuery.Symbol,
PreQuery.LowForSymbol,
PreQuery.HighForSymbol,
tFinal.Today as DateOfMatch,
tFinal.Low as DateMatchLow,
tFinal.High as DateMatchHigh
from
( select
t1.symbol,
min( t1.low ) as LowForSymbol,
max( t1.high ) as HighForSymbol
from
table1 t1
where
t1.today between YourFromDateParameter and YourToDateParameter
group by
t1.symbol ) PreQuery
JOIN table1 tFinal
on PreQuery.Symbol = tFinal.Symbol
AND tFinal.today between YourFromDateParameter and YourToDateParameter
AND ( tFinal.Low = LowForSymbol
OR tFinal.High = HighForSymbol )
I am looking for a way to derive a weighted average from two rows of data with the same number of columns, where the average is as follows (borrowing Excel notation):
(A1*B1)+(A2*B2)+...+(An*Bn)/SUM(A1:An)
The first part reflects the same functionality as Excel's SUMPRODUCT() function.
My catch is that I need to dynamically specify which row gets averaged with weights, and which row the weights come from, and a date range.
EDIT: This is easier than I thought, because Excel was making me think I required some kind of pivot. My solution so far is thus:
select sum(baseSeries.Actual * weightSeries.Actual) / sum(weightSeries.Actual)
from (
select RecordDate , Actual
from CalcProductionRecords
where KPI = 'Weighty'
) baseSeries inner join (
select RecordDate , Actual
from CalcProductionRecords
where KPI = 'Tons Milled'
) weightSeries on baseSeries.RecordDate = weightSeries.RecordDate
Quassnoi's answer shows how to do the SumProduct, and using a WHERE clause would allow you to restrict by a Date field...
SELECT
SUM([tbl].data * [tbl].weight) / SUM([tbl].weight)
FROM
[tbl]
WHERE
[tbl].date >= '2009 Jan 01'
AND [tbl].date < '2010 Jan 01'
The more complex part is where you want to "dynamically specify" the what field is [data] and what field is [weight]. The short answer is that realistically you'd have to make use of Dynamic SQL. Something along the lines of:
- Create a string template
- Replace all instances of [tbl].data with the appropriate data field
- Replace all instances of [tbl].weight with the appropriate weight field
- Execute the string
Dynamic SQL, however, carries it's own overhead. Is the queries are relatively infrequent , or the execution time of the query itself is relatively long, this may not matter. If they are common and short, however, you may notice that using dynamic sql introduces a noticable overhead. (Not to mention being careful of SQL injection attacks, etc.)
EDIT:
In your lastest example you highlight three fields:
RecordDate
KPI
Actual
When the [KPI] is "Weight Y", then [Actual] the Weighting Factor to use.
When the [KPI] is "Tons Milled", then [Actual] is the Data you want to aggregate.
Some questions I have are:
Are there any other fields?
Is there only ever ONE actual per date per KPI?
The reason I ask being that you want to ensure the JOIN you do is only ever 1:1. (You don't want 5 Actuals joining with 5 Weights, giving 25 resultsing records)
Regardless, a slight simplification of your query is certainly possible...
SELECT
SUM([baseSeries].Actual * [weightSeries].Actual) / SUM([weightSeries].Actual)
FROM
CalcProductionRecords AS [baseSeries]
INNER JOIN
CalcProductionRecords AS [weightSeries]
ON [weightSeries].RecordDate = [baseSeries].RecordDate
-- AND [weightSeries].someOtherID = [baseSeries].someOtherID
WHERE
[baseSeries].KPI = 'Tons Milled'
AND [weightSeries].KPI = 'Weighty'
The commented out line only needed if you need additional predicates to ensure a 1:1 relationship between your data and the weights.
If you can't guarnatee just One value per date, and don't have any other fields to join on, you can modify your sub_query based version slightly...
SELECT
SUM([baseSeries].Actual * [weightSeries].Actual) / SUM([weightSeries].Actual)
FROM
(
SELECT
RecordDate,
SUM(Actual)
FROM
CalcProductionRecords
WHERE
KPI = 'Tons Milled'
GROUP BY
RecordDate
)
AS [baseSeries]
INNER JOIN
(
SELECT
RecordDate,
AVG(Actual)
FROM
CalcProductionRecords
WHERE
KPI = 'Weighty'
GROUP BY
RecordDate
)
AS [weightSeries]
ON [weightSeries].RecordDate = [baseSeries].RecordDate
This assumes the AVG of the weight is valid if there are multiple weights for the same day.
EDIT : Someone just voted for this so I thought I'd improve the final answer :)
SELECT
SUM(Actual * Weight) / SUM(Weight)
FROM
(
SELECT
RecordDate,
SUM(CASE WHEN KPI = 'Tons Milled' THEN Actual ELSE NULL END) AS Actual,
AVG(CASE WHEN KPI = 'Weighty' THEN Actual ELSE NULL END) AS Weight
FROM
CalcProductionRecords
WHERE
KPI IN ('Tons Milled', 'Weighty')
GROUP BY
RecordDate
)
AS pivotAggregate
This avoids the JOIN and also only scans the table once.
It relies on the fact that NULL values are ignored when calculating the AVG().
SELECT SUM(A * B) / SUM(A)
FROM mytable
If I have understand the problem then try this
SET DATEFORMAT dmy
declare #tbl table(A int, B int,recorddate datetime,KPI varchar(50))
insert into #tbl
select 1,10 ,'21/01/2009', 'Weighty'union all
select 2,20,'10/01/2009', 'Tons Milled' union all
select 3,30 ,'03/02/2009', 'xyz'union all
select 4,40 ,'10/01/2009', 'Weighty'union all
select 5,50 ,'05/01/2009', 'Tons Milled'union all
select 6,60,'04/01/2009', 'abc' union all
select 7,70 ,'05/01/2009', 'Weighty'union all
select 8,80,'09/01/2009', 'xyz' union all
select 9,90 ,'05/01/2009', 'kws' union all
select 10,100,'05/01/2009', 'Tons Milled'
select SUM(t1.A*t2.A)/SUM(t2.A)Result from
(select RecordDate,A,B,KPI from #tbl)t1
inner join(select RecordDate,A,B,KPI from #tbl t)t2
on t1.RecordDate = t2.RecordDate
and t1.KPI = t2.KPI