当count(*) = 0时，使用WHERE子句时，SQL查询不返回行

I'm trying to write a query that returns the name of the school, the year of the payment, the cost of the payment and the number of students there was the year of the payment. The problem I encounter is that for a certain year there is 0 student so the query doesn't return any row although there was a payment.I'm trying to write a query that returns the na