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Primary Key Primer for SQL Server

Every database developer uses keys, but without always understanding all the ramifications. They come with few hard and fast rules, but if you get them right from the start with a database design, the whole process of database development is simpler, and the result is likely to perform better. We asked Phil for advice, little knowing that the explanation might take a while.

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SQL Server tablediff utility

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Question of the Day

Multiple Values Inserted

I have this code on SQL Server 2022. What happens when it runs all at once?

DROP TABLE IF EXISTS dbo.Commission
GO
CREATE TABLE dbo.Commission
(id INT NOT NULL IDENTITY(1,1) CONSTRAINT CommissionPK PRIMARY KEY
, salesperson VARCHAR(20)
, commission VARCHAR(20)
)
GO
INSERT dbo.Commission
( salesperson, commission)
VALUES
( 'Brian', 12 ),
( 'Brian', 'None' )
GO
 

See possible answers