SQL:select * from knowledge_window.favourites where user_id='' and url_id='' ERROR:Table 'knowledge_window.favourites' doesn't exist
巧变除为乘
也就是说,把除法变成乘法,例如:除以 1/4可以变成乘 4。
7.6÷ 0.25
3.5÷ 0.12