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Note The default setting for Windows 2000 is circular logging turned on.

It means that the row with Order ID 10248 and Product ID 11 can only appear once in the table.Note: You cannot enforce referential integrity using declarative integrity constraints if child and parent tables are on different nodes of a distributed database.However, you can enforce referential integrity in a distributed database using database triggers (see next section).A Primary Key can be formed by a single column or a combination of multiple columns.For example, categories table uses single column Category ID as the unique identifier.

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