You are given the requirement for a simple database for the national football  league(NFL). The NFL has many teams, and each team has a name, a city, a coach, a  captain and a set of players. Each players belong to only one team and each player  has a name, a position (such as left wing, mid fielder or a goal keeper) , a skill level,  and a set of injury records. A team captain is also a player who guide other player  and a game is played between two teams(referred as host team and guest team) and  has a match date( such as june 11, 2018) and score (such as 2 to 5)  Your design should include an E-R diagram, a set of relational schemas,  and a list of constraints, including primary-key and foreign-key constraints.

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Transaction Processing

Transaction processing is a computational style generally performed by server computers, which supports interactive applications (apps). Transaction processing is also known as information processing, which divides the work into indivisible and individual operations called transactions. The transaction is a set of tasks; a single task is considered as the minimum processing unit that cannot be divided again.