Need help to solve update querry for multiple records.

Question

Could any of you please provide update querry for the following scenario.
Requiremnt:
1. Update the UNIQUE_ID of record ( same Identifier and Identifier_code
where END_Date is not null) with the UNIQUE_ID of the record (( same  Identifier and Identifier_code
where END_Date  is null).
2. If More than one NULL in END_date then update UNIQUE_ID with max(EFFective_Date) of UNIQUE_ID
Source  data
UNIQUE_ID
Identifier
Identifier_code
EFFective_Date
END_Date
1
777
abc
2/14/2014 11:15
2/28/2014 9:00
1
777
abc
2/21/2014 9:00
3/7/2014 9:02
2
777
abc
2/28/2014 9:00
3/14/2014 9:02
2
777
abc
3/7/2014 9:02
3/14/2014 9:02
2
777
abc
3/14/2014 9:02
NULL
5
888
xyz
2/14/2014 11:15
2/28/2014 9:00
5
888
xyz
2/21/2014 9:00
3/7/2014 9:02
5
888
xyz
2/28/2014 9:00
3/14/2014 9:02
6
888
xyz
3/7/2014 9:02
NULL
7
888
xyz
3/14/2014 9:02
NULL
OutPUT .
UNIQUE_ID
Identifier
Identifier_code
EFFective_Date
END_Date
2
777
abc
2/14/2014 11:15
2/28/2014 9:00
2
777
abc
2/21/2014 9:00
3/7/2014 9:02
2
777
abc
2/28/2014 9:00
3/14/2014 9:02
2
777
abc
3/7/2014 9:02
3/14/2014 9:02
2
777
abc
3/14/2014 9:02
NULL
7
888
xyz
2/14/2014 11:15
2/28/2014 9:00
7
888
xyz
2/21/2014 9:00
3/7/2014 9:02
7
888
xyz
2/28/2014 9:00
3/14/2014 9:02
7
888
xyz
3/7/2014 9:02
NULL
7
888
xyz
3/14/2014 9:02
NULL
Thanks in advance.

Answer 1

Hi Vikash,
This query will not produce results as per requirement:
Try it with following data
Insert into @TempTABLE values (1,777,'abc','2/14/2014 11:15','3/14/2014 9:02')
Insert into @TempTABLE values (1,777,'abc','2/21/2014 9:00','3/14/2014 9:02')
Insert into @TempTABLE values (2,777,'abc','2/28/2014 9:00','3/14/2014 9:02')
Insert into @TempTABLE values (2,777,'abc','3/7/2014 9:02','3/14/2014 9:02')
Insert into @TempTABLE values (2,777,'abc','3/14/2014 9:02',NULL)
Insert into @TempTABLE values (5,888,'xyz','2/14/2014 11:15','3/14/2014 9:02')
Insert into @TempTABLE values (5,888,'xyz','2/21/2014 9:00','3/14/2014 9:02')
Insert into @TempTABLE values (5,888,'xyz','2/28/2014 9:00','3/14/2014 9:02')
Insert into @TempTABLE values (7,888,'xyz','3/7/2014 9:02',NULL)
Insert into @TempTABLE values (6,888,'xyz','3/14/2014 9:02',NULL)
as per the problem statement, all records having 888,'xyz' should be updated with 6 not 7 as max effective date is associated with 6 not 7.
Ashutosh
Nope.
can you check the original post first. It clearly states output as having 7 as id for all the records with 888,xyz
also your above posted sample data is different from original sample data as you've dates jumpled up for the records with ids 6 and 7
Please see the illustration for original sample data
--sample table for illustration
declare @t table
(UNIQUE_ID int,Identifier int,Identifier_code varchar(100),EFFective_Date datetime ,END_Date datetime)
--populate original sample data
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (1, 777, N'abc', CAST(0x0000A2D200B964F0 AS DateTime), CAST(0x0000A2E0009450C0 AS DateTime))
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (1, 777, N'abc', CAST(0x0000A2D9009450C0 AS DateTime), CAST(0x0000A2E70094DD60 AS DateTime))
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (2, 777, N'abc', CAST(0x0000A2E0009450C0 AS DateTime), CAST(0x0000A2EE0094DD60 AS DateTime))
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (2, 777, N'abc', CAST(0x0000A2E70094DD60 AS DateTime), CAST(0x0000A2EE0094DD60 AS DateTime))
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (2, 777, N'abc', CAST(0x0000A2EE0094DD60 AS DateTime), NULL)
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (5, 888, N'xyz', CAST(0x0000A2D200B964F0 AS DateTime), CAST(0x0000A2E0009450C0 AS DateTime))
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (5, 888, N'xyz', CAST(0x0000A2D9009450C0 AS DateTime), CAST(0x0000A2E70094DD60 AS DateTime))
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (5, 888, N'xyz', CAST(0x0000A2E0009450C0 AS DateTime), CAST(0x0000A2EE0094DD60 AS DateTime))
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (6, 888, N'xyz', CAST(0x0000A2E70094DD60 AS DateTime), NULL)
INSERT @t ([UNIQUE_ID], [Identifier], [Identifier_code], [EFFective_Date], [END_Date]) VALUES (7, 888, N'xyz', CAST(0x0000A2EE0094DD60 AS DateTime), NULL)
--do the update
UPDATE t
SET UNIQUE_ID = MaxID
FROM
SELECT MAX(CASE WHEN END_DATE IS NULL THEN UNIQUE_ID END) OVER (PARTITION BY Identifier,Identifier_code) AS MaxID,UNIQUE_ID
FROM @t
)t
WHERE UNIQUE_ID <> MaxID
AND MaxID IS NOT NULL
--now check the output
SELECT * FROM @t
The output is as below
UNIQUE_ID Identifier Identifier_code EFFective_Date END_Date
2 777 abc 2014-02-14 11:15:00.000 2014-02-28 09:00:00.000
2 777 abc 2014-02-21 09:00:00.000 2014-03-07 09:02:00.000
2 777 abc 2014-02-28 09:00:00.000 2014-03-14 09:02:00.000
2 777 abc 2014-03-07 09:02:00.000 2014-03-14 09:02:00.000
2 777 abc 2014-03-14 09:02:00.000 NULL
7 888 xyz 2014-02-14 11:15:00.000 2014-02-28 09:00:00.000
7 888 xyz 2014-02-21 09:00:00.000 2014-03-07 09:02:00.000
7 888 xyz 2014-02-28 09:00:00.000 2014-03-14 09:02:00.000
7 888 xyz 2014-03-07 09:02:00.000 NULL
7 888 xyz 2014-03-14 09:02:00.000 NULL
Now compare it with original output and you'll find they're the same
UNIQUE_ID Identifier Identifier_code EFFective_Date END_Date
2 777 abc 2/14/2014 11:15 2/28/2014 9:00
2 777 abc 2/21/2014 9:00 3/7/2014 9:02
2 777 abc 2/28/2014 9:00 3/14/2014 9:02
2 777 abc 3/7/2014 9:02 3/14/2014 9:02
2 777 abc 3/14/2014 9:02 NULL
7 888 xyz 2/14/2014 11:15 2/28/2014 9:00
7 888 xyz 2/21/2014 9:00 3/7/2014 9:02
7 888 xyz 2/28/2014 9:00 3/14/2014 9:02
7 888 xyz 3/7/2014 9:02 NULL
7 888 xyz 3/14/2014 9:02 NULL
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