In addition to the other answers, you could create a computed column on the table to provide what you are asking for.
CREATE TABLE dbo.MyTable
(
Id int NOT NULL PRIMARY KEY,
CombinedId AS 'ABCD-' + CAST(Id as varchar(16))
)
Or:
CREATE TABLE dbo.MyTable
(
Id int NOT NULL PRIMARY KEY,
PrefixField varchar(16),
CombinedId AS PrefixField + CAST(Id as varchar(16))
)
(Your question doesn't say whether the prefix is intended to be fixed or not...)
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