Consider the following relation schema pertaining to a training database:Trainee (traineeno, name, address)Enroll (traineeno, courseno, coursename)where the primary keys are shown underlined. The number of tuples in the Trainee and Enroll tables are 60 and 10 respectively. What are the maximum and minimum number of tuples that can be present in (Student * Enroll), where ‘*’ denotes inner join ?
Question
Consider the following relation schema pertaining to a training database:Trainee (traineeno, name, address)Enroll (traineeno, courseno, coursename)where the primary keys are shown underlined. The number of tuples in the Trainee and Enroll tables are 60 and 10 respectively. What are the maximum and minimum number of tuples that can be present in (Student * Enroll), where ‘*’ denotes inner join ?
Solution
The inner join operation, denoted by '*', combines rows from different tables if they satisfy a given join condition. In this case, the join is being performed on the 'traineeno' attribute which is common to both the Trainee and Enroll tables.
The maximum number of tuples in the result of the join operation (Trainee * Enroll) can be the same as the number of tuples in the Enroll table, assuming that every 'traineeno' in the Enroll table has a matching 'traineeno' in the Trainee table. So, the maximum number of tuples can be 10.
The minimum number of tuples in the result of the join operation can be zero. This would occur if there are no matching 'traineeno' values in the Trainee and Enroll tables.
So, the maximum and minimum number of tuples that can be present in (Trainee * Enroll) are 10 and 0 respectively.
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