Q2/I/ draw the entity relationship for each of the following: 1-" a student studies one or many modules and a module is studied by one or many students". 2-" a manager leads one or many employees and an employee is led by one and only one manager". 3- " a manager leads one or many employees and an employee is led by one and only one manager and if there is a manager who has no employees to lead". 4- "a classroom has one and only one lecturer to manage and a lecturer has one and only one classroom". 5- "each classroom has one or many students registered in and a student has one or many classrooms to be registered in".

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A: Below are the required queries: