scott/tiger用户登陆：emp表和dept
1、查看当前用户详细信息：select * from user_users;
2、按格式：NO:7369,ENAME:SMITH,JOB:CLERK输出：select 'NO:'||e.empno||',ENAME:'||e.ename||',JOB:'||e.job from emp e where e.empno = '7369';