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Conceptual Questions
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1) A RDBMS is a relational database management system which allows the ability to modify, access and process data stored within a relational database

2) SQL is a Structured Query Language that is used to interact and access a database through commands like Create, Select etc.

3) The ER model is an Entity Relationship model, which is a diagram showing unique entities that would reside within a database and their relationships towards other entities through cardinality.

4) One-to-one:  There exist an entity X and entity Y where in their relation there exists only one of each.
   One-to-many: There exists an entity X and entity Y where in their relation there exists only one of X and more than one Y.
   Many-to-many: There exists an entity X and entity Y where in their relation there exists more than one of each.

5) A primary key is a unique identifier of a subset of information. It needs to be unique as to refrain from having two of the same keys being used to identify two tables which will cause obvious errors.

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SQL Exercises
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6)
CREATE TABLE IF NOT EXISTS Customers {
    id INTEGER NOT NULL AUTO_INCREMENT,
    fname VARCHAR(30) NOT NULL,
    lname VARCHAR(30) NOT NULL,
    address VARCHAR(30) NOT NULL,
    city VARCHAR(30) NOT NULL,
    zip UNSIGNED INTEGER(5) NOT NULL,
    email VARCHAR(30) NOT NULL,

    PRIMARY KEY(id)
};