之前我们介绍过:SQL Server 2008学习笔记之联合结果集union的使用,本文我们介绍一下SQL Server 2008学习笔记之去重和给新加字段赋值的相关知识,接下来就让我们一起来了解一下这部分内容吧。
增加两个字段:
class="dp-xml">
- alter TABLE T_Employee Add FSubCompany VARchar(20);
- ALTER TABLE T_Employee ADD FDepartment VARCHAR(20);
给新加的字段赋值
- UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='Development' where FNumber='DEV001';
- UPDATE T_Employee SET FSubCompany='ShenZhen',FDepartment='Development' where FNumber='DEV002';
- UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='HumanResource' where FNumber='HR001';
- UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='HumanResource' where FNumber='HR002';
- UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='InfoTech' where FNumber='IT001';
- UPDATE T_Employee SET FSubCompany='ShenZhen',FDepartment='InfoTech' where FNumber='IT002';
- UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='Sales' where FNumber='SALES001';
- UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='Sales' where FNumber='SALES002';
- UPDATE T_Employee SET FSubCompany='ShenZhen',FDepartment='Sales' where FNumber='SALES003';
查询并去重
- select distinct FDepartment from T_Employee
- select distinct FDepartment,FSubCompany from T_Employee
关于SQL Server 2008学习笔记之去重和给新加字段赋值的相关知识就介绍到这里了,希望本次的介绍能够对您有所收获!