yu1150的博客

在学习SQL的时候出现了很多低级错误 如下 use master CREATE DATABASE SQL2012Db ON PRIMARY ( NAME = Sql2012Data, FILENAME ='E:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\Sql2012Data.mdf', SIZ

C#2012数据库编程入门经典中第56页给出了如下代码 Select count(*) as "Total Records" from Person.Contact Select count(Title) as "Not Null Titles" from Person.Contact 结果为 Total Reconds 19972 Not Null Titles 1009 但