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           select empno,ename,sal,deptno from emp
          where deptno=20;
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           select empno,ename,sal,deptno from emp
          where deptno=20;
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ʾÀýÒ»£ºselect job,sal,comm from emp where ename='SMITH';
           update emp set job='check',sal=2200,comm=200
           where ename='SCOTT';
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           select job,sal,comm from emp where ename='SMITH')
           where ename='SCOTT';
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        Name varchar(20)
       )
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