1.数据库AND & OR 运算符和ORDER BY 关键字
SELECT * FROM Websites WHERE country='CN' AND alexa > 50;
ORDER BY:关键字用于对结果集按照一个列或者多个列进行排序。(asc升序,desc降序)
SELECT column_name,column_name
FROM table_name
ORDER BY column_name,column_name ASC|DESC;
FROM table_name
ORDER BY column_name,column_name ASC|DESC;
SELECT * FROM Websites ORDER BY alexa DESC;