Question

in a database for an online shopping company, what kind of field would email address likely be in the customer table 1.candidate key 2.primary 3.both 4.none of the above​

Answer 1

Answer:

3.Both

Explanation:

Eight types of key in DBMS are Super, Primary, Candidate, Alternate, Foreign, Compound, Composite, and Surrogate Key. A super key is a group of single or multiple keys which identifies rows in a table. Primary Key never accept null values while a foreign key may accept multiple null values.

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