站长资源数据库
SQL学习笔记八 索引，表连接，子查询，ROW_NUMBER
简介索引 经常要查询的语句，则给它建一个索引 表连接 select T_Oders as o join T_Customers as C on o.CustomerId = c.Id 子查询 单值子查询 单列多值子查询 ROW_NUMBER()函数 ROW_NUMBER() OVER(ORDER BY
索引
经常要查询的语句，则给它建一个索引
表连接
select T_Oders as o join T_Customers as C on o.CustomerId = c.Id
子查询
单值子查询
单列多值子查询
ROW_NUMBER()函数
ROW_NUMBER() OVER(ORDER BY Fsalary DESC)
经常要查询的语句，则给它建一个索引
表连接
select T_Oders as o join T_Customers as C on o.CustomerId = c.Id
子查询
单值子查询
单列多值子查询
ROW_NUMBER()函数
ROW_NUMBER() OVER(ORDER BY Fsalary DESC)