not overlap data in sql server

Member 8214635 asked:

hi guys,

i have a table in sql server like this

student_ID Course month mark

student get a mark in each month
i want if a june mark is in databse for particular student id then it not store again on it. But in july month data is store for same student with same Id.

but i dont want to store a mark on same month.

please help
thanks

Tags: SQL, Server

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