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This chapter is from the book

Table-Level Integrity

This type of integrity is a major component of overall data integrity, and it ensures the following.

  • There are no duplicate records in a table.
  • The primary key exclusively identifies each record in a table.
  • Every primary key value is unique.
  • Primary key values are not null.

You began establishing table-level integrity when you defined a primary key for each table and ensured its enforcement by making absolutely certain that each primary key fully complied with the Elements of a Primary Key. In the next chapter, you’ll enhance the table’s integrity further as you establish field specifications for each field within the table.

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