What are primary keys in accounting databases, and what purpose do they serve? Explain the terms primary key, candidate key, and foreign key. Give an example for each. What are the main constraints when a relational database model is being logically designed? Explain yo...
How to create a table in MySQL If a 1:M relationship is optional on the 1 side and mandatory on the M side, which of the following is true? The resulting foreign key can have null (empty) values. The resulting foreign key cannot ha What is...