performance_main

Purpose: Stores general performance information for a question (date, cohort size, etc).
Joins: questions and properties tables

Field	Type	Purpose
id	int(11)	Auto increment field for the table
q_id	int(10) unsigned	ID of the question
paperID	int(10) unsigned	ID of the paper
percentage	tinyint(4)	Percentage size used to run the Frequency/Discrimination Analysis report.
cohort_size	int(10) unsigned	How many students took the exam.
taken	date	Date the exam was taken.

ExamSys