Update table that does not have a IDENTITY column

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I have a sql server database table whose is as below

SQL

CREATE TABLE UserNotifications
(
[Ref_NotificationType_ID] [int] NOT NULL, this is a foreign key column
[From_Employee_ID] [int] NOT NULL, this is a foreign key column
[To_Empoyee_ID] [int] NOT NULL, this is a foreign key column
[Ref_Identity_ID] [bigint] NOT NULL, this is a foreign key column
[Identity_Type] [smallint] NOT NULL,
[VersionNumber] [int] NOT NULL,
[Priority] [bit] NOT NULL,
[Created_DateTime] [datetime] NOT NULL,
[Created_By] [varchar](max) NOT NULL,
[Last_Updated_DateTime] [datetime] NULL,
[Last_Updated_By] [varchar](max) NULL,
[HasUserRead] [bit] NOT NULL,
[IsActive] [bit] NOT NULL,
[Flag] [bit] NOT NULL
)

How do i update a specific column in this above table without affecting other matching rows?

What I have tried:

I tried updating a record by using the created_datetime column

Posted 12-Mar-16 10:33am

Christopher Fernandes

Updated 12-Mar-16 11:17am

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Comments

RedDk 13-Mar-16 21:22pm

By update do you mean insert records or delete records? If so, I would do an indexing of the table before the update, using IDENTITY (1,1), sort on that index, do your insert/delete then remove the index. That last operation isn't even really necessary.

One of the things I've always liked about SQL Server is that it is extremely easy to think outside of the box and do WHATEVER you feel like doing. Don't be discouraged by boneheads who say not to use this or never use that.

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F-ES Sitecore · Answer 1 · 2016-03-12T11:17:00

Solution 1

You need a way to uniquely identify the row even if it is based on multiple columns

SQL

update UserNotifications set field=value where
Ref_NotificationType_ID = 1
and From_Employee_ID = 100
and To_Empoyee_ID = 200
and ...

Posted 12-Mar-16 11:17am

F-ES Sitecore