使用MySQL中的ENUM字段选择行

让我们首先创建一个表-

create table DemoTable -> ( -> EmployeeStatus ENUM(FULLTIME,Intern) default NULL -> );

使用插入命令在表中插入一些记录-

insert into DemoTable values(FULLTIME); insert into DemoTable values(Intern); insert into DemoTable values(Intern); insert into DemoTable values();

使用select语句显示表中的所有记录-

select * from DemoTable;

这将产生以下输出-

+----------------+ | EmployeeStatus | +----------------+ | FULLTIME | | Intern | | Intern | | NULL | +----------------+ 4 rows in set (0.00 sec)

这是使用MySQL中的ENUM字段选择行的查询-

select * from DemoTable -> where EmployeeStatus is null or EmployeeStatus <> Intern;+----------------+ | EmployeeStatus | +----------------+ | FULLTIME | | NULL | +----------------+ 2 rows in set (0.00 sec)