To join 'n' tables 'n-1' conditions should be satisfied.
So to join 4 tables 3 conditions should be satisfied.
The default return value from a function is int. In other words, unless explicitly specified the default return value by compiler would be integer value from function.
A .MOV file is a common multimedia container file format developed by Apple. It may contain multiple tracks that store different types of media data and is often used for saving movies and other video files.
Primary key helps us to identify a row uniquely in a relation
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