【文件属性】:
文件名称:orcle 数据库
文件大小:48KB
文件格式:DOC
更新时间:2018-07-23 02:26:53
数据库
select t.employeeid,t.empfirstname,t.emplastname from employees t(下划线不能掉)
select t.employeeid,lower(t.empfirstname),t.emplastname from employees t
select t.employeeid,t.empfirstname,t.emplastname from employees t where t.empfirstname = 'ann'
为什么查询不到