I hope you might be able to help. I'm a novice at SQL so this one is starting to bug me.
Currently I am collecting data every day for a Meter Name. This data is currently being logged in a table with the columns TimeStamp, Name, Value. However I would like to create a query which will only return the most recent (last) value recorded against each Name in the table.
I've built this query so far but the Top 1 syntax doesn't seem to be what I need.
SELECT Top 1 (DataLog.Timestamp), MeterTags.Name, DataLog.Value
FROM Meters
INNER JOIN MeterTags
ON Meters.MeterId = MeterTags.MeterId
INNER JOIN DataLog
ON MeterTags.MeterTagId = DataLog.MeterTagId
WHERE Meters.MeterTypeId = 8
GROUP By MeterTags.Name, DataLog.Timestamp
Any advice you could give would be appreciated.
Thanks in advance.
You can use ROW_NUMBER to give each record a rownumber (resetting to 0 for each MeterTags.Name) then just select the first for each name:
WITH CTE AS
( SELECT DataLog.Timestamp,
MeterTags.Name,
DataLog.Value,
RowNumber = ROW_NUMBER() OVER(PARTITION BY MeterTags.Name
ORDER BY DataLog.TimeStamp DESC)
FROM Meters
INNER JOIN MeterTags
ON Meters.MeterId = MeterTags.MeterId
INNER JOIN DataLog
ON MeterTags.MeterTagId = DataLog.MeterTagId
WHERE Meters.MeterTypeId = 8
)
SELECT CTE.Timestamp,
CTE.Name,
CTE.Value
FROM CTE
WHERE CTE.RowNumber = 1;
Another solution is to use the TOP 1 inside an APPLY:
SELECT DataLog.Timestamp,
MeterTags.Name,
DataLog.Value
FROM Meters
INNER JOIN MeterTags
ON Meters.MeterId = MeterTags.MeterId
CROSS APPLY
( SELECT TOP 1 TimeStamp, Value
FROM DataLog
WHERE MeterTags.MeterTagId = DataLog.MeterTagId
ORDER BY TimeStamp DESC
) DataLog
WHERE Meters.MeterTypeId = 8;
Try below query
select Timestamp,Name,Value
from
(
SELECT (DataLog.Timestamp), MeterTags.Name, DataLog.Value,rownum,ROW_NUMBER() OVER
(PARTITION BY MeterTags.Name ORDER BY DataLog.Timestamp desc) AS rownum FROM Meters
INNER JOIN MeterTags
ON Meters.MeterId = MeterTags.MeterId
INNER JOIN DataLog
ON MeterTags.MeterTagId = DataLog.MeterTagId
)data
where rownum=1
Related
I have select query :
select
f.FirmaID,f.FirmaAdi,t.BelgeID,t.BelgeTuru,t.Tarih,t2.Plaka,t2.SasiNo,t4.AracMarka,t4.AracTip,case when x.Miktar=1 then 4 else x.miktar end as LastikAdet,
t3.CariKodu,t3.CariAdi,t3.CariGsm1,t3.CariGsm2,t3.CariTel1,t3.CariTel2,t3.CariAdres
from alsatr t WITH (NOLOCK)
left join Firma f WITH (NOLOCK) on f.FirmaID = t.AlsatrFirmaID
left join AracBilgi t2 WITH (NOLOCK) on t2.AracBilgiUID = t.AsAracBilgiUID and t2.AracBilgiID= t.AracBilgi
left join Cari t3 WITH (NOLOCK) on t.AsCariUID= t3.CariUID
left join Araclar t4 WITH (NOLOCK) on t4.AracID= t2.AB_AracID
outer apply
(select COUNT(1) soktak,Miktar FROM alsatD d WITH (NOLOCK)
where
d.AlsatDUID = t.AlsatrUID and d.AsStokKodu='LA-0001' group by Miktar) x
where
isnull(t3.FiloID,0) > 0
and t.Tarih between '04.30.2020' and '04.31.2020'
and t.BelgeTuru=55
and x.soktak > 0
and f.FirmaID not in (1,2,103,106,109,114)
order by t.Tarih desc, f.FirmaID desc, t.BelgeID desc
So I want to select all records between two days but I want to select one,latest record (maybe depends on last BelgeID ) on same day with same plate (plaka).
Enclose your query inside a CTE and use ROW_NUMBER() window function:
WITH cte AS (
<your query here>
)
SELECT
t.FirmaID, t.FirmaAdi, t.BelgeID, t.BelgeTuru, t.Tarih, t.Plaka, t.SasiNo, t.AracMarka,
t.AracTip, t.LastikAdet, t.CariKodu, t.CariAdi, t.CariGsm1, t.CariGsm2, t.CariTel1,
t.CariTel2, t.CariAdres
FROM (
SELECT *, ROW_NUMBER() OVER (PARTITION BY Tarih, Plaka ORDER BY BelgeID DESC) rn
FROM cte
) t
WHERE t.rn = 1
I have the below CTEs that work perfectly, but I want to count the "cl.memb_dim_id" by "cl.post_date" but I am not sure how to do that? When adding in the count function I get an error that highlights the ' row number' so I am assuming I cant have both order and group together ????
WITH
DATES AS
(
select to_date('01-jan-2017') as startdate,to_date('02-jan-2017') as enddate
from dual
),
Claims as (select distinct
cl.memb_dim_id,
row_number () over (partition by cl.Claim_number order by cl.post_date desc) as uniquerow,
cl.Claim_number,
cl.post_date,
ct.claim_type,
ap.claim_status_desc,
dc.company_desc,
dff.io_flag_desc,
pr.product_desc,
cl.prov_dim_id,
cl.prov_type_dim_id
from dw.fact_claim cl
inner join dates d
on 1=1
and cl.post_date >= d.startdate
and cl.post_date <= d.enddate
and cl.provider_par_dim_id in ('2')
and cl.processing_status_dim_id = '1'
and cl.company_dim_id in ('581','585','586','589','590','591','588','592','594','601','602','603','606','596','598','597','579','599','578','577','573','574','576','575')
left join dw.DIM_CLAIM_STATUS ap
on cl.claim_status_dim_id = ap.claim_status_dim_id
left join dw.dim_claim_type ct
on cl.claim_type_dim_id = ct.claim_type_dim_id
and cl.claim_type_dim_id in ('1','2','6','7')
left join dw.DIM_COMPANY dc
on cl.company_dim_id = dc.company_dim_id
left join dw.DIM_IO_FLAG dff
on cl.io_flag_dim_id = dff.io_flag_dim_id
left join dw.dim_product pr
on cl.product_dim_id = pr.product_dim_id
)
Select * from claims where uniquerow ='1'
First, does this work?
count(cl.memb_dim_id) over (partition by cl.Claim_number, cl.post_date) as cnt,
Second, it is strange to be using analytic functions with select distinct.
I have the following SQL which works - It displays all of the items, along with the MAX starttime.
However, I'd also like to show items that to not have a record in playlistlog - How would one
SELECT items.idx, items.title, items.artist, playlistlog.starttime
FROM items
LEFT JOIN playlistlog ON playlistlog.item = items.idx
WHERE playlistlog.starttime = (
SELECT MAX(starttime)
FROM playlistlog AS pl2
WHERE pl2.item = items.idx
)
The where clause is turning your left join into an inner join.
Use AND instead of WHERE.
SELECT items.idx, items.title, items.artist, playlistlog.starttime
FROM items
LEFT JOIN playlistlog ON playlistlog.item = items.idx
and playlistlog.starttime = (
SELECT MAX(starttime)
FROM playlistlog AS pl2
WHERE pl2.item = items.idx
)
This can be done a bit shorter using standard SQL's window function:
SELECT items.idx, items.title, items.artist, pl.starttime
FROM items
LEFT JOIN (
select item,
starttime,
row_number() over (partition by item order by starttime desc) as rn
from playlistlog
) pl ON pl.item = items.idx AND pl.rn = 1
I have a table where I need to get the oldest date from a group and be able to return all rows. I'm finding it difficult since I need to return the system_id field.
AssignedProfsHistory MatterID EffectiveDate
1 33434-3344 08/22/2005
2 33434-3344 07/12/2004
3 33434-3344 07/12/2004
4 21122-323 12/05/2007
5 43332-986 10/18/2014
6 43332-986 03/23/2013
So in this example, the rows for systemid 2 & 3 should return because they are tied for earliest date. The row for systemid 4 should return and systemid 6 should be returned.
This is what I have so far. Because I need to include the systemid(AssignedProfHistory) I'm not getting the results I need.
SELECT aph.AssignedProfsHistory,
m.MatterID,
Min(aph.EffectiveDate) as 'EffectiveDate'
from AssignedProfsHistory aph
INNER JOIN Matters m
ON aph.Matters = m.Matters
WHERE aph.AssignedType = 'Originating'
Group by m.matters,m.matterid,aph.assignedprofshistory
order by m.MatterID
Any idea how to get the results I need?
Thank you in advance.
select AssignedProfsHistory, MatterID, EffectiveDate
from (
SELECT
aph.AssignedProfsHistory,
m.MatterID,
aph.EffectiveDate,
row_number() over(partition by m.MatterID order by aph.EffectiveDate) as rn
from AssignedProfsHistory aph
INNER JOIN Matters m ON aph.Matters = m.Matters
WHERE aph.AssignedType = 'Originating'
) t
where rn = 1;
You can use the row_number window function to assign row numbers to dates for each matterid. Because the ordering is based on the ascending EffectiveDate, rows with the oldest date get assigned 1 and you select those.
If a matterid can have multiple rows with the oldest dates, you can use rank or dense_rank to get all the rows for the oldest date.
Since you want to keep the ties, I'd do it like this:
SELECT t2.AssignedProfsHistory, m.MatterID, t2.EffectiveDate
FROM (
SELECT MatterID, MIN(EffectiveDate) med
FROM AssignedProfsHistory
WHERE AssignedType = 'Originating'
GROUP BY MatterID
) t1
INNER JOIN AssignedProfsHistory t2 ON t2.MatterID = t1.MatterID
and t2.EffectiveDate = t1.med and t2.AssignedType = 'Originating'
INNER JOIN Matters m on m.Matters = t2.Matters
ORDER BY m.MatterId
Here is an SQLFiddle without the Matters table that demonstrates it can work, no windowing functions or CTE required, though a CTE would allow you to avoid repeating the AssignedType='Originating' condition.
this should get you what you need
with cte as (
SELECT aph.AssignedProfsHistory,
m.MatterID,
aph.EffectiveDate as 'EffectiveDate'
from AssignedProfsHistory aph
INNER JOIN Matters m
ON aph.Matters = m.Matters
WHERE aph.AssignedType = 'Originating'
Group by m.matters,m.matterid,aph.assignedprofshistory
)
select
AssignedProfsHistory,
MatterID,
EffectiveDate
from
cte
join (
select
min(EffectiveDate) min_effectivedate,
MatterID
from
cte
group by
MatterID
) b on cte.EffectiveDate = b.min_effectivedate and
cte.MatterID = b.MatterID
order by AssignedProfsHistory
First take the older date and then join it with your table.
WITH OlderAPH AS (
SELECT
AssignedProfsHistory,
Matters,
MIN(EffectiveDate) OlderDate
FROM AssignedProfsHistory
WHERE AssignedType = 'Originating'
GROUP BY Matters, AssignedProfsHistory )
SELECT
O.AssignedProfsHistory, M.MatterID, O.OlderDate
FROM OlderAPH O
INNER JOIN Matters M ON O.Matters = M.Matters
ORDER BY M.MatterID
I am trying to implement an inner join to compare values of two tables, however failing for some reason and the query is returning zero columns.
I have two tables security and security_his and trying to join them on columns SECURITY_ID and INVESTMENT_OBJECTIVE. Query is as follows
SELECT *
FROM SECURITY origin
INNER JOIN (
SELECT *
FROM SECURITY_HIS t2
WHERE DATED = (
SELECT MAX(DATED)
FROM SECURITY_HIS t1
WHERE t1.SECURITY_ID = t2.SECURITY_ID
)
) history ON origin.SECURITY_ID = history.SECURITY_ID
AND origin.INVESTMENT_OBJECTIVE = history.INVESTMENT_OBJECTIVE;
WITH cte as (
SELECT S.*,
row_number() over
(partition by S.SECURITY_ID ORDER BY SH.DATED DESC)
FROM SECURITY S
JOIN SECURITY_HIS SH
ON S.SECURITY_ID = SH.SECURITY_ID
AND S.INVESTMENT_OBJECTIVE = SH.INVESTMENT_OBJECTIVE
)
SELECT *
FROM cte
WHERE rn = 1
You have no GROUP BY on the innermost query, so only a single value, maxed over the entire table, is returned. However your query can also be simplified for easier understanding:
SELECT origin.*, history.Dated
FROM SECURITY origin
INNER JOIN (
SELECT
SECURITY_ID,
INVESTMENT_OBJECTIVE,
MaxDated = MAX(DATED)
FROM SECURITY_HIS t2
GROUP BY
SECURITY_ID,
INVESTMENT_OBJECTIVE
) history ON origin.SECURITY_ID = history.SECURITY_ID
AND origin.INVESTMENT_OBJECTIVE = history.INVESTMENT_OBJECTIVE