1.一般操作符 (1)!= 不等于 select empno,ename,job from scott.emp where job!='manager' (2)^= 不等于 select empno,ename,job from scott.emp where job^='manager' (3)<>不等于 select empno,ename,job from scott.emp where job<>'manager' (4)<小于 (5)>大于 (6)<=小…
!= 不等于 select empno,ename,job from scott.emp where job!='manager' ^= 不等于 select empno,ename,job from scott.emp where job^='manager' <>不等于 select empno,ename,job from scott.emp where job<>'manager' <小于 select sal from scott.emp where sal<…