SELECT u.name, o.amount FROM users u JOIN orders o ON u.id = o.user_id; 使用UNION代替OR、优化ORDER BY和GROUP BY 确保 ORDER BY 和 GROUP BY 的列上有索引。 例子:在排序和分组列上添加索引。 CREATE INDEX idx_order_date ON orders ...
We are inviting applications for a Research Assistant Professor position. The Research Assistant Professor will be primarily responsible for working on projects ...