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Update on on join where maximum date value Expand / Collapse
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Posted Wednesday, February 6, 2013 7:27 AM
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Last Login: Wednesday, August 20, 2014 9:32 AM
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Hi,

I have an 'items' table that I need to update where and the Date_Effective is the MAX value for matching
Location, ProdCode and Customer column values from the 'Staging1' table. Any columns can be updated other than the Location, ProdCode and Customer columns. (All dates are YMD format)

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Items_TEST](
[Id] [bigint] IDENTITY(1,1) NOT NULL,
[Location] [nvarchar](5) NOT NULL,
[ProdCode] [nvarchar](5) NOT NULL,
[Item] [nvarchar](6) NULL,
[Customer] [nvarchar](10) NOT NULL,
[Date_Effective] [smalldatetime] NOT NULL,
[Source] [nvarchar](5) NOT NULL,
[User] [nvarchar](50) NULL,
[Date_Exported] [smalldatetime] NULL,
[Time_Exported] [nvarchar](8) NULL,
[Add1] [numeric](7, 2) NOT NULL CONSTRAINT [DF_Items_TEST_Add1] DEFAULT ((0.00)),
[Add2] [numeric](7, 2) NOT NULL CONSTRAINT [DF_Items_TEST_Add2] DEFAULT ((0.00)),
CONSTRAINT [PK_Items_TEST] PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]


truncate table dbo.Items_TEST
;

INSERT INTO dbo.Items_TEST
(
Location, ProdCode, Item, Customer, Date_Effective, Source, [User], Date_Exported, Time_Exported, Add1, Add2
)
VALUES ('9999', '3004', NULL, 'EEVEY', '2012-09-16', 'FV', 'SM', '2012-11-19', '12:01:29', '0.00', '3.00')
;

INSERT INTO dbo.Items_TEST
(
Location, ProdCode, Item, Customer, Date_Effective, Source, [User], Date_Exported, Time_Exported, Add1, Add2
)
VALUES ('9999', '3004', NULL, 'EEVEY', '2012-09-17', 'FV', 'SM', '2012-12-20', '09:14:54', '4.00', '0.00')
;

INSERT INTO dbo.Items_TEST
(
Location, ProdCode, Item, Customer, Date_Effective, Source, [User], Date_Exported, Time_Exported, Add1, Add2
)
VALUES ('9999', '3004', NULL, 'EEVEY', '2012-09-18', 'FV', 'SM', '2013-01-10', '14:36:23', '5.00', '0.00')
;

INSERT INTO dbo.Items_TEST
(
Location, ProdCode, Item, Customer, Date_Effective, Source, [User], Date_Exported, Time_Exported, Add1, Add2
)
VALUES ('5544', '3002', NULL, 'PESS', '2012-09-17', 'FV', 'SM', '2013-01-10', '14:36:23', '1.50', '0.00')
;


SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Staging1](
[Location] [nvarchar](5) NOT NULL,
[ProdCode] [nvarchar](5) NOT NULL,
[Item] [nvarchar](6) NULL,
[Customer] [nvarchar](10) NOT NULL,
[Date_Effective] [smalldatetime] NOT NULL,
[Source] [nvarchar](5) NOT NULL,
[User] [nvarchar](50) NULL,
[Date_Exported] [smalldatetime] NULL,
[Time_Exported] [nvarchar](8) NULL,
[Add1] [numeric](7, 2) NOT NULL CONSTRAINT [DF_Staging1_Add1] DEFAULT ((0.00)),
[Add2] [numeric](7, 2) NOT NULL CONSTRAINT [DF_Staging1_Add2] DEFAULT ((0.00))
) ON [PRIMARY]


TRUNCATE TABLE dbo.Staging1
;

INSERT INTO dbo.Staging1
(
Location, ProdCode, Item, Customer, Date_Effective, Source, [User], Date_Exported, Time_Exported, Add1, Add2
)
VALUES ('5544', '3002', NULL, 'PESSY', '2012-09-21', 'FV', 'SM', '2013-01-19', '14:08:31', '0.50', '0.40')
;

INSERT INTO dbo.Staging1
(
Location, ProdCode, Item, Customer, Date_Effective, Source, [User], Date_Exported, Time_Exported, Add1, Add2
)
VALUES ('9999', '3004', NULL, 'EEVEY', '2012-09-21', 'FV', 'SM', '2013-01-19', '14:08:31', '7.00', '0.00')
;

So, in the above examples, 2 records should be updated:
1.
Add1 becomes '7.00'
where Location = '9999'
AND ProdCode = '3004'
AND Customer = 'EEVE'
AND Date_Effective = '18/09/2012 00:00:00'

(This has the greatest Date_Effective value of the 3 rows)

2.
Add1 becomes '0.50'
AND Add2 becomes '0.40'
where Location = '5544'
AND ProdCode = '3002'
AND Customer = 'PESS'

Any ideas please?

Thanks in advance,
Post #1416502
Posted Wednesday, February 6, 2013 8:19 AM


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Here's one way, I think

update it
set Add1 = s.Add1
,Add2 = s.Add2
from dbo.items_test it
join dbo.Staging1 s on it.Location = s.Location
and it.ProdCode = s.ProdCode
and it.Customer = s.Customer
where it.Date_Effective = (
select max(date_effective)
from dbo.Items_TEST t
where t.Location = it.Location
and t.ProdCode = it.ProdCode
and t.Customer = it.Customer
)




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Post #1416536
Posted Wednesday, February 6, 2013 8:46 AM
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Phil - Many thanks!! It looks like it's done the trick
Post #1416556
Posted Wednesday, February 6, 2013 8:57 AM


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Great, no problem!


Help us to help you. For better, quicker and more-focused answers to your questions, consider following the advice in this link.

When you ask a question (and please do ask a question: "My T-SQL does not work" just doesn't cut it), please provide enough information for us to understand its context.
Post #1416567
Posted Wednesday, February 6, 2013 8:58 AM
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One more way

2 remarks before the discussion about the way to update your table:

1) Try not to use column names that are also reserved words in SQL Server. The column name user is not a good name and it forces us to use square brackets in the code
2) In you example you had different customer names PESS and PESSY. In the requested solution you treated both customers as the same one. I treated it as a typo.

There are few ways to do what you want. The steps to do it are to identify the columns that should be updated and then update those columns in an update statement that uses from clause with join. I've used CTE that marks those records and give them a value of 1 in a column that is called RowNum. Then I run an update statement on the CTE. The code bellow shows it:
with MyCTE as (
select Location, ProdCode, Item, Customer, Date_Effective, Source, [User], Date_Exported, Time_Exported, Add1, Add2,
row_number() over (partition by Location, ProdCode, Customer order by Date_Effective desc) AS RowNum
from Items_TEST)
update MyCTE
SET MyCTE.Item = Staging1.Item,
MyCTE.Date_Effective = Staging1.Date_Effective,
MyCTE.Source = Staging1.Source,
MyCTE.[User] = Staging1.[User],
MyCTE.Date_Exported = Staging1.Date_Exported,
MyCTE.Time_Exported = Staging1.Time_Exported,
MyCTE.Add1 = Staging1.Add1,
MyCTE.Add2 = Staging1.Add2
from Staging1 inner join MyCTE on Staging1.Customer = MyCTE.Customer
AND Staging1.Location = MyCTE.Location
AND Staging1.ProdCode = MyCTE.ProdCode
AND MyCTE.RowNum = 1




Adi


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Post #1416568
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