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Chapter 5 DAD220 SNHU Exam Questions and Answers

DAD220 Ch 3 Questions and Answers | Latest Update | 2024/2025 | Graded A+ What is the primary key of the PhoneNumber table? (Area code, Exchange, Number) is unique, non-null, and minimal, so (AreaCode, Exchange, Number) is a primary key. Occasionally, a primary key includes all columns in a table. Foreign Key A foreign key is a column, or group of columns, that refer to a primary key. Non-NULL foreign key values must match some value of the primary key. The data types of the foreign and...

DAD220 Ch 3 | relational database formats and purposes and basic query skills | Latest 2024/25

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