排序
功能介绍：
可以指定排序字段和排序方向，使查询结果按一定的顺序展现
语法描述：
SELECT select_list
FROM T
WHERE search_condition
ORDER BY order_expression[ ASC | DESC ], ......
参数说明：
|
order_expression |
排序字段或者排序表达式 |
|
ASC |
升序 |
|
DESC |
降序 |
举例：
|
SELECT OrderID,CustomerID,EmployeeID,ReceiveDate,ShipDate,Amount FROM Orders ORDER BY Amount DESC |
根据Amount降序排序 |
|
SELECT OrderID,CustomerID,EmployeeID,ReceiveDate,ShipDate,Amount FROM Orders ORDER BY EmployeeID |
不指定升降序，默认为升序；根据EmployeeID升序排序 |
|
SELECT EmpID,Name,Title,age(BirthDate) Age,HireDate,Boss,HomeCity FROM Employee ORDER BY Age DESC,HireDate ASC |
按年龄先降序，再按入职日期升序 |