SQL学习笔记五去重,给新加字段赋值的方法
2011-08-28 22:28
656 查看
去掉数据重复
增加两个字段
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
增加两个字段
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
您可能感兴趣的文章:
相关文章推荐
- SQL学习笔记五去重,给新加字段赋值的方法
- SQL学习笔记五去重,给新加字段赋值
- C#实现利用反射简化给类字段赋值的方法
- sharepoint2010的几个类型字段赋值和取值的方法
- oracle 查询两个字段赋值到一个字段的方法
- asp.net水晶报表参数字段在代码中赋值的方法
- ArcEngine对Blob字段赋值的方法
- 在CRUD操作中与业务无关的SQL字段赋值的方法
- php上传图片获取路径及给表单字段赋值的方法
- A.3.2-创建简单的类(人类),包含的概念(字段,构造,封装字段,创建方法,创建对象,赋值,调用方法)
- Sharepoint 列表字段赋值取值方法
- 关于有他表关联的字段,赋值时候存在的字符转数字错误的解决方法
- php上传图片得到路径给表单字段赋值的通用方法
- php上传图片得到路径给表单字段赋值的通用方法
- php上传图片获取路径及给表单字段赋值的方法
- asp.net水晶报表参数字段在代码中赋值的方法
- ArcEngine对Blob字段赋值的方法
- sharepoint2010的几个类型字段赋值和取值的方法
- php上传图片得到路径给表单字段赋值的通用方法
- 数据表中查询日期字段为空的记录并进行赋值的方法