I am trying to write a query that will find the max expiration date but what i noticed is when I am doing this I get no results if I have a expiration date lets say 30-Dec-16 and for the same part I also have an expiration date of 01-Jan-2099 (which is the default date if nothing is filled in) below is my query how could I rewrite the expiration_date query to get the correct date.
SELECT
Part,
price,
effective_date,
expiration_date
FROM a.Table
WHERE Part IN ('&Part')
AND PRICE IN ('somewere')
AND expiration_date IN (SELECT
MAX(expiration_date)
FROM table
WHERE expiration_date > SYSDATE
AND part IN ('&Part)
AND PRICE IN (Somewere))
AND to_date(effective_date) IN (SELECT
MAX(EFFECTIVE_DATE) FROM b.table
WHERE expiration_date > SYSDATE
AND Part IN ('&Part)
AND price IN (somewere)
AND EFFECTIVE_DATE < SYSDATE + 1)
I would use ROW_NUMBER. https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions137.htm
Here is the query:
SELECT
part
,price
,effective_date
,expieration_date
FROM (
SELECT
part
,price
,effective_date
,expieration_date
,ROW_NUMBER() OVER (PARTITION BY part ORDER BY expieration_date DESC) AS "row"
FROM #tbl
WHERE effective_date < SYSDATE + 1
) tbl
WHERE "row" = 1
Here is what I used to populate #tbl.
DECLARE #tbl TABLE (
part NVARCHAR(MAX)
,price FLOAT
,effective_date DATETIME2(3)
,expieration_date DATETIME2(3)
)
INSERT #tbl (part, PRICE, EFFECTIVE_DATE, EXPIERATION_DATE)
VALUES ('Apples',7.95,'2016-12-01','2016-12-30')
,('Apples',7.95,'2016-11-01','2016-11-30')
,('Apples',7.95,'2016-12-30','2099-01-01')
Related
I have a hypothetical SQL table "EVENTS", with two columns, a UUID index column, and a DateTime column,
The table is populated with values ranging from 1900-01-01 to today, it is not ordered, there are numerous dates missing.
The query that I have to run is basically 'retrieve all events that happened at the requested date (start to the end of the day) or the closest previous date'
If I were looking for all events in a day that I know that exists in the database it would be something as simple as:
SELECT * FROM Events e
WHERE
e.date BETWEEN $START_OF_DAY AND $END_OF_DAY;
But if that date doesn't exist I must retrieve the latest date up to the requested date.
Grab current day, but if no records found, will return all records from the nearest previous day with records.
So in my sample data, Jan 2 returns 3 events dated Jan 1
SQL Server Solution
DECLARE #Input DATE = '2022-01-02' /*Try Jan 1,2,3, or 4*/
DROP TABLE IF EXISTS #Event
CREATE TABLE #Event (ID INT IDENTITY(1,1),EventDateTime DATETIME)
INSERT INTO #Event
VALUES
('2022-01-01 08:00')
,('2022-01-01 09:00')
,('2022-01-01 10:00')
,('2022-01-03 12:00')
SELECT TOP (1) WITH TIES *
FROM #Event AS A
CROSS APPLY (SELECT EventDate = CAST(EventDateTime AS DATE)) AS B
WHERE B.EventDate <= #Input
ORDER BY B.EventDate DESC
SQL Fiddle wasn't letting me create a variable, but here's a the code conceptually for a more efficient version for MySQL. It grabs the desired date range in the first query, then uses it to filter in the second query. I think it should perform far better than the accepted answer assuming you have an index on EventDateTime
CREATE TABLE Event (
ID MEDIUMINT NOT NULL AUTO_INCREMENT
,EventDateTime DATETIME
,PRIMARY KEY (ID));
INSERT INTO Event (EventDateTime)
VALUES
('2022-01-01 08:00')
,('2022-01-01 09:00')
,('2022-01-01 10:00')
,('2022-01-03 12:00');
/*Need to save these off to variables to use in later query*/
SELECT TIMESTAMP(CAST(EventDateTime AS DATE)) AS StartRange
,TIMESTAMP(CAST(EventDateTime AS DATE)) + INTERVAL 1 DAY AS EndRange
FROM Event
WHERE EventDateTime < DATE_ADD('2022-01-04' /*Input*/,INTERVAL 1 DAY)
ORDER BY EventDateTime DESC
LIMIT 1;
SELECT *
FROM Event
WHERE EventDateTime >= StartRange
AND EventDateTime < EndRange
Calculate the most recent date, and do a self join. Although I'm using MYSQL, I believe this is the most generic workaround
CREATE TABLE d0207Event (ID INT ,EventDateTime DATETIME)
INSERT INTO d0207Event
VALUES
(1,'2022-01-01 08:00')
,(2,'2022-01-01 09:00')
,(3,'2022-01-01 10:00')
,(4,'2022-01-03 12:00')
INSERT INTO d0207Event
VALUES
(5, '2021-12-12 08:00');
select t1.*
from d0207Event t1,
(
select min(t1.dat) mindat
from (
select t1.*,
DATEDIFF('2022-01-02', cast(t1.EventDateTime as date)) dat
from d0207Event t1
) t1
where t1.dat >= 0
) t2
where DATEDIFF('2022-01-02', cast(t1.EventDateTime as date)) = t2.mindat
;
There are also many advanced syntaxes that can solve this problem better, depending on which DB you use and your specific application scenario
It seems that you can also choose a database with more syntax, then using an analytic function usually solves the efficiency problem well, since the EVENT table only needs to be queried once.
CREATE TABLE Event (
ID MEDIUMINT NOT NULL AUTO_INCREMENT
,EventDateTime DATETIME
,PRIMARY KEY (ID));
INSERT INTO Event (EventDateTime)
VALUES
('2022-01-01 08:00')
,('2022-01-01 09:00')
,('2022-01-01 10:00')
,('2022-01-03 12:00');
select *
from (
select t1.*,
first_value(cast(t1.EventDateTime as date))
over(order by cast(t1.EventDateTime as date) desc) fv
from event t1
where cast(t1.EventDateTime as date) <= '2022-01-03'
) t1
where cast(t1.EventDateTime as date) = fv
Creating a functional index cast(t1.EventDateTime as date), or creating a virtual column directly can make the query easier, otherwise using date_add() is a good way
I have a merge statement that builds my SCD type 2 table each night. This table must house all historical changes made in the source system and create a new row with the date from/date to columns populated along with the "islatest" flag. I have come across an issue today that I am not really sure how to handle.
There looks to have been multiple changes to the source table within a 24 hour period.
ID Code PAN EnterDate Cost Created
16155 1012401593331 ENRD 2015-11-05 7706.3 2021-08-17 14:34
16155 1012401593331 ENRD 2015-11-05 8584.4 2021-08-17 16:33
I use a basic merge statement to identify my changes however what would be the best approach to ensure all changes get picked up correctly? The above is giving me an error as it's trying to insert/update multiple rows with the same value
DECLARE #DateNow DATETIME = Getdate()
IF Object_id('tempdb..#meteridinsert') IS NOT NULL
DROP TABLE #meteridinsert;
CREATE TABLE #meteridinsert
(
meterid INT,
change VARCHAR(10)
);
MERGE
INTO [DIM].[Meters] AS target
using stg_meters AS source
ON target.[ID] = source.[ID]
AND target.latest=1
WHEN matched THEN
UPDATE
SET target.islatest = 0,
target.todate = #Datenow
WHEN NOT matched BY target THEN
INSERT
(
id,
code,
pan,
enterdate,
cost,
created,
[FromDate] ,
[ToDate] ,
[IsLatest]
)
VALUES
(
source.id,
source.code ,
source.pan ,
source.enterdate ,
source.cost ,
source.created ,
#Datenow ,
NULL ,
1
)
output source.id,
$action
INTO #meteridinsert;INSERT INTO [DIM].[Meters]
(
[id] ,
[code] ,
[pan] ,
[enterdate] ,
[cost] ,
[created] ,
[FromDate] ,
[ToDate] ,
[IsLatest]
)
SELECT ([id] ,[code] ,[pan] ,[enterdate] ,[cost] ,[created] , #DateNow ,NULL ,1 FROM stg_meters a
INNER JOIN #meteridinsert cid
ON a.id = cid.meterid
AND cid.change = 'UPDATE'
Maybe you can do it using merge statement, but I would prefer to use typicall update and insert approach in order to make it easier to understand (also I am not sure that merge allows you to use the same source record for update and insert...)
First of all I create the table dimscd2 to represent your dimension table
create table dimscd2
(naturalkey int, descr varchar(100), startdate datetime, enddate datetime)
And then I insert some records...
insert into dimscd2 values
(1,'A','2019-01-12 00:00:00.000', '2020-01-01 00:00:00.000'),
(1,'B','2020-01-01 00:00:00.000', NULL)
As you can see, the "current" is the one with descr='B' because it has an enddate NULL (I do recommend you to use surrogate keys for each record... This is just an incremental key for each record of your dimension, and the fact table must be linked with this surrogate key in order to reflect the status of the fact in the moment when happened).
Then, I have created some dummy data to represent the source data with the changes for the same natural key
-- new data (src_data)
select 1 as naturalkey,'C' as descr, cast('2020-01-02 00:00:00.000' as datetime) as dt into src_data
union all
select 1 as naturalkey,'D' as descr, cast('2020-01-03 00:00:00.000' as datetime) as dt
After that, I have created a temp table (##tmp) with this query to set the enddate for each record:
-- tmp table
select naturalkey, descr, dt,
lead(dt,1,0) over (partition by naturalkey order by dt) enddate,
row_number() over (partition by naturalkey order by dt) rn
into ##tmp
from src_data
The LEAD function takes the next start date for the same natural key, ordered by date (dt).
The ROW_NUMBER marks with 1 the oldest record in the source data for the natural key in the dimension.
Then, I proceed to close the "current" record using update
update d
set enddate = t.dt
from dimscd2 d
join ##tmp t
on d.naturalkey = t.naturalkey
and d.enddate is null
and t.rn = 1
And finally I add the new source data to the dimension with insert
insert into dimscd2
select naturalkey, descr, dt,
case enddate when '1900-00-00' then null else enddate end
from ##tmp
Final result is obtained with the query:
select * from dimscd2
You can test on this db<>fiddle
I'm trying to plug a formula into a query to pull back how much should have run on a particular contract.
The formula itself is quite simple, but I can't find anywhere how to take the minimum date between 3, based on each record separately.
I need to calculate which is the earliest of Term_date, Suspend_date and today's date, some of which may be NULL, on each contract.
And interesting way to approach this is to use cross apply:
select t.contractid, mindte
from table t cross apply
(select min(dte) as mindte
from (values(t.term_date), (t.suspend_date), (getdate())) d(dte)
) d;
CASE
WHEN Term_date < Suspend_date AND Term_date < GETDATE() THEN Term_date
WHEN Suspend_date < GETDATE() THEN Suspend_date
ELSE GETDATE()
END AS MinimumDate
I know a CASE statement will be suggested, but I thought I'd try something different:
;WITH cte (RecordID, CheckDate) AS
( SELECT RecordID, Term_date FROM sourcetable UNION ALL
SELECT RecordID, Suspend_date FROM sourcetable UNION ALL
SELECT RecordID, GETDATE() FROM sourcetable )
SELECT src.RecordID, src.Field1, src.Field2, MinDate = MIN(cte.CheckDate)
FROM sourcetable src
LEFT JOIN cte ON cte.RecordID = src.RecordID
GROUP BY src.RecordID, src.Field1, src.Field2
Here is a method using cross apply to generate a work table from which you can get the minimum date:
-- mock table with sample testing data
declare #MyTable table
(
id int identity(1,1) primary key clustered,
term_date datetime null,
suspend_date datetime null
)
insert into #MyTable (term_date, suspend_date)
select null, null
union all select '1/1/2015', null
union all select null, '1/2/2015'
union all select '1/3/2015', '1/3/2015'
union all select '1/4/2015', '1/5/2015'
union all select '1/6/2015', '1/5/2015'
select * from #MyTable
select datevalues.id, min([date])
from #MyTable
cross apply
(
values (id, term_date), (id, suspend_date), (id, getdate())
) datevalues(id, [date])
group by datevalues.id
I have a system which stores the history of a balance in a history table.
The table has the account number, sort code, balance, balance start date, balance end date.
When a balance is updated an entry is created in the history table which shows what the balance, what the date was when that balance first started and the date which shows when the balances changed. So for example the table will show a balance of $100.00 and this balance ran from 07/10/2013 to 07/15/2013.
What I'm trying to do is get the sum of the balances for all sort codes on a specific day however the balance may not have changed on this date so I would need to return the closest prior date but I'm failing.
This is what I tried so far.
declare #sdate datetime
set #sdate = '06/08/2012' --mm/dd/yyyy
SELECT CONVERT(varchar(20),MAX(StartDate),103) as "Closest Start Date", Sort, SUM(Balance) AS "Sum of balances"
FROM BalanceHistory
WHERE StartDate <= convert(smalldatetime ,#sdate) AND SortCode <> 'ABC123456'
GROUP BY SortCode
SELECT FROM BalanceHistory would produce something like
AccountNumber, SortCode, Balance, StartDate, EndDate, RECID
00000001, srt010203, 100.00, 06/01/2013, 06/02/2013, RECID
00000001, srt010203, 110.00, 06/02/2013, 06/03/2013, RECID
00000001, srt010203, 120.00, 06/03/2013, 06/04/2013, RECID
00000002, srt010204, 200.00, 06/01/2013, 06/02/2013, RECID
00000003, srt010204, 300.00, 06/01/2013, 06/02/2013, RECID
00000004, srt010205, 400.00, 06/01/2013, 06/02/2013, RECID
00000005, srt010205, 500.00, 06/01/2013, 06/02/2013, RECID
You can do this without a JOIN by using the ROW_NUMBER() function (assuming SQL Server 2005 or newer):
DECLARE #sdate DATE
SET #sdate = '2012-06-08'
SELECT SortCode, SUM(Balance)'Sum of Balances'
FROM (SELECT AccountNumber,SortCode, Balance,ROW_NUMBER() OVER (PARTITION BY AccountNumber ORDER BY StartDate DESC)'RowRank'
FROM BalanceHistory
WHERE StartDate <= #sdate AND SortCode <> 'ABC123456'
)sub
WHERE RowRank = 1
GROUP BY SortCode
Demo: SQL Fiddle
The ROW_NUMBER() function in the subquery assigns a 'RowRank' to the balance for each accountnumber, we order by StartDate DESC to get rank of '1' for the most recent balance for each accountnumber, the WHERE criteria limits it to most recent balance from the date you set in your variable. Then you use that rank in the outer query to limit only to that one balance.
This should work
Declare #table as table
(AccountNo int,
Balance money,
DateEntered datetime)
Declare #dt datetime
set #dt = '2013-07-01'
Insert into #table values(1, 100, '2013-04-01')
Insert into #table values(2, 200, '2013-04-01')
Insert into #table values(2, 300, '2013-05-01')
Insert into #table values(2, 400, '2013-06-01')
--select AccountNo, Max(Balance), Max(DateEntered) MaxDateEntered From #table where DateEntered <= #dt group by AccountNo
Select Sum(t.Balance) From #table t
inner join (select AccountNo, Max(Balance) Balance, Max(DateEntered) MaxDateEntered From #table where DateEntered <= #dt group by AccountNo) tm
on t.AccountNo = tm.AccountNo and t.DateEntered = tm.MaxDateEntered
enter code here
CREATE TABLE #AvailableDate (
CustomKey INT IDENTITY (1,1),
SelectedFaceID INT,
FromDate DATETIME,
ToDate DATETIME,
TempDate DATETIME,
Diff INT)
INSERT INTO #AvailableDate(SelectedFaceID, FromDate, ToDate, TempDate, Diff)
SELECT
SelectedFaceID,
FromDate,
ToDate,
(SELECT TOP 1 ToDate FROM #AvailableDate WITH(NOLOCK) ORDER BY #AvailableDate.CustomKey DESC),
(SELECT DATEDIFF(
d,
ToDate,
(SELECT TOP 1 ToDate FROM #AvailableDate ORDER BY CustomKey DESC)
)
)
FROM
SelectedFace WITH(NOLOCK)
Here I haven't been getting the value of SELECT TOP 1 ToDate FROM #AvailableDate WITH(NOLOCK) ORDER BY #AvailableDate.CustomKey DESC in above query or any value associated with #AvailableDate
You are creating a brand-new temp table and expect it to have some values because you are doing a select on that same table you just created. Values will be there only after you populate it.
You can still use temp table, though you will have to re-arrange your batch and first make an insert and later update records with TempDate and Diff fields.