Final answer:
The four main elements of a relational database include tables, fields, records, and keys, each serving a specific function to organize and relate data effectively.
Step-by-step explanation:
The four main elements in a relational database are tables (or relations), fields (or columns), records (or rows), and keys. A table represents a collection of related data entries and it consists of columns and rows. Fields are the columns in a table that are designed to maintain specific information about every record in the table. Records are the rows in a table, where each record contains a unique instance of data for the categories defined by the fields. Keys are special fields that serve two main purposes: to uniquely identify a record (a primary key) and to create a logical relationship between different data records (a foreign key).