Tracking student performance over time with SQL

I have this table in SQL of student grades:

Using Lag and Lead functions in SQL

I have this table on medical patients:

SQL: Finding out if an event happened before or after another event

I have two tables like this:

SQL: Finding out if an event happened before or after another event

I have two tables like this:

Finding out which movies are overdue in SQL

I have two tables in SQL:

Finding out which movies are overdue in SQL

I have two tables in SQL:

Finding out which movies are overdue in SQL

I have two tables in SQL:

Finding out which movies are overdue in SQL

I have two tables in SQL:

Finding out which movies are overdue in SQL

I have two tables in SQL:

Finding out which movies are overdue in SQL

I have two tables in SQL: