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ʾÀýÒ»£ºinsert into employee (empno,ename,sal,deptno)
           select empno,ename,sal,deptno from emp
          where deptno=20;
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           select empno,ename,sal,deptno from emp
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ʾÀýÒ»£ºselect job,sal,comm from emp where ename='SMITH';
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           where ename='SCOTT';
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           where ename='SCOTT';
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     t_user(
        ID varchar(20),
        Name varchar(20)
       )
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        ID NAME
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