私はMySQLを学んでいて、クエリで簡単な算術演算をしようとしています.Instructors大学の各学部の数を決定するコマンドを書こうとしています.誰か助けてもらえますか? ありがとうございました！
以下は私の2つのテーブルです：
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| Department | Faculty | Building |
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| Humanities | Arts and Sciences | Chardon |
| English | Arts and Sciences | Chardon |
| Mathematics | Arts and Sciences | Monzon |
| General Engineering | Engineering | Stefani |
| Agronomy | Agriculture | Pinero |
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| Professor | Department | Rank | Salary |
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| Joe Blow | Biology | Professor | $73,500.00 |
| Sam Snow | Mathematics | Instructor | $45,700.00 |
| George Grow | Electrical Engineering | Associate Professor | $69,250.00 |
| Hiram Lowe | English | Assistant Professor | $63,750.00 |