查询语句

 

------使用distinct消除重复值----



use AdventureWorks



select distinct HireDate

from HumanResources.Employee



-----在聚合函数中使用distinct -----



-----如果你想计算产品列表的平均价格，可以使用如下查询语句----



select AVG(ListPrice) from Production.Product





-----使用列别名-----



select Color as 'Grouped Color', 

AVG(DISTINCT ListPrice) as 'Average Distinct List Price',

AVG(ListPrice) 'Average List Price'

from Production.Product

group by Color

use AdventureWorks



-----对结果排序-----



select select_list

[INTO new_table_name]

from table_list

[WHERE search_conditions]

[GROUP BY group_by_list]

[HAVING search_conditions]

[ORDER by order_list [ASC | DESC]]