Basics of Sets and Relations #7

Consider the following data table named Student.

Student Name        Number  Sex  
Nina                3412    F 
Mike                1234    M  
Nelson              2341    F  

Here is another data table named Teaching Assistants

Subject     ID
Physics     3412
Chemistry   1111
Mathematics 2341  

What is the count of rows returned in the following join operation?
Student ⊳⊲(Number=ID) Teaching Assistants

Only enter a single integer. Do not include any extra spaces or newlines.

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