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You could define the ID as a computed column evaluating to a constant value, and declare that column to be unique: CREATE TABLE dbo.Configuration ( ID AS CAST(1 AS tinyint), -- or: AS bit ... -- other columns CONSTRAINT UQ_Configuration_ID UNIQUE (ID) );


You can also use trigger.. create trigger LimitTable on YourTableToLimit after insert as declare @tableCount int select @tableCount = Count(*) from YourTableToLimit if @tableCount > 50 begin rollback end go


These two constraints would do: CREATE TABLE dbo.Configuration ( ConfigurationID TINYINT NOT NULL DEFAULT 1, -- the rest of the columns CONSTRAINT Configuration_PK PRIMARY KEY (ConfigurationID), CONSTRAINT Configuration_OnlyOneRow CHECK (ConfigurationID = 1) ) ; You need both the PRIMARY KEY (or a UNIQUE constraint) so no two rows have the ...


Seems a bit of an odd requirement but ho-hum :) You could just have a constraint on the table and then only allow updates (no insert or deletes) to the table? CREATE TABLE dbo.Config ( ID INT identity(1,1), CONFIGURATION VARCHAR(MAX), constraint ck_limitrows CHECK (ID <=1) ); It's a bit of a hackey way to do it though, would it not ...

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