CST 363 Week 4
Briefly summarize 5 things what you have learned in the course so far. 1. Constraints - Constraints are rules that apply to table columns to ensure the appropriate data is received/ An example of this would be NOT NULL or UNIQUE. NOT NULL ensures the value is not empty and UNIQUE ensures values are not duplicated. 2. Primary Keys - A primary key uniquely identifies each row in a table. They must be unique and they cannot be null. A primary key can consists of most data types and if the data type is an integer it can be auto-incremented with each new entry into a table. Primary Keys can also consist of more than one column as long as e...