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create-primary-keys.md

A table can contain only one PRIMARY KEY constraint. All columns defined within a PRIMARY KEY constraint must be defined as NOT NULL. If nullability is not specified, all columns participating in a ...
GitHub

create-clustered-indexes.md

When you create a PRIMARY KEY constraint, a unique clustered index on the column or columns is automatically created if a clustered index on the table does not already exist and you do not specify a ...