Find MAX value in two columns simultaneously in SQL table - sql

Question

Can somebody help?
I have this table (simplified view, it has 20 columns and more then 1 mln rows)
date_id period_time PlotsID dateOfContractID
20071225 1:12:45 212 a12f
20080812 1:12:45 212 a12f
20080815 10:07:46 232 f45j
20100213 8:05:12 435 y54g
20100213 8:06:33 435 y54g
And I need to find all data with MAX date_id and MAX period_time, grouped by PlotsID
And it must be this
date_id period_time PlotsID dateOfContractID
20080812 1:12:45 212 a12f
20080815 10:07:46 232 f45j
20100213 8:06:33 435 y54g
Using this code, I found MAX date_id and it's working correct, but I need after Max date find MAx Period_time, OR find in one step
SELECT
[date_id],
[period_time],
[PlotsID],
[FieldID],
[partnerContract],
[ownerContractID],
[partnerContractCode]
FROM
bd
WHERE
EXISTS(
SELECT
1 AS Expr1
FROM
bd AS t2
WHERE
partnerContractCode = bd.partnerContractCode
GROUP BY
partnerContractCode
HAVING
( bd.date_id = MAX(date_id) )
)
) AS t1
Create TABLE
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE bd
( [hash_diff] [varbinary](8000) NOT NULL,
[hash_key] [varbinary](8000) NULL,
[date_id] [int] NULL,
[period_time] [time](7) NULL,
[PlotsID] [bigint] NULL,
[FieldID] [bigint] NULL,
[partnerContract] [nvarchar](100) NULL,
[ownerContractID] [bigint] NULL,
[partnerContractCode] [nvarchar](50) NULL,
)
WITH
(
DISTRIBUTION = HASH ( [hash_key] ),
CLUSTERED INDEX
(
[date_id] ASC
)
)
GO

Answer 1

Try this
DECLARE #tbl_SampleData AS TABLE ( date_id DATE, period_time varchar(8), plotsID INT, dateOfContractID VARCHAR(10))
INSERT INTO #tbl_SampleData (date_id , period_time , plotsID , dateOfContractID )
VALUES
('20071225', '1:12:45', 212, 'a12f'),
('20080812', '1:12:45', 212, 'a12f'),
('20080815', '10:07:46', 232, 'f45j'),
('20100213', '8:05:12', 435, 'y54g'),
('20100213', '8:06:33', 435, 'y54g')
--SELECT * FROM #tbl_SampleData
SELECT date_id, period_time, plotsID, dateOfContractID FROM
(
SELECT date_id, period_time, plotsID, dateOfContractID ,
ROW_NUMBER() OVER(PARTITION BY PlotsID ORDER BY date_id DESC, period_time DESC) AS RowID
FROM #tbl_SampleData
) AS a
WHERE RowID = 1