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A.select count(*) from emp
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C.select min(*) from emp
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B.SELECT * FROM Student Group BY 'age';
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A.select ename,nvl（comm.,0）from emp
B.select ename,null（comm.,0）from emp
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A.dir mylog
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A.在Oracle中运行" select instr(''abcdef'',''e'') from dual;"的结果是：4
B.在Oracle中运行"select rtrim(''abcdef'',''bc'') from dual; "的结果是：abcdef
C.在Oracle中运行" select replace(''a&a&b'',''&'',''-'') from dual;"的结果是：a-a-b
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A.SELECT * FROM stud ORDER BY birthday DESC LIMIT 8;
B.SELECT * FROM stud ORDER BY birthday ASC LIMIT 8;
C.SELECT * FROM stud ORDER BY birthday ASC LIMIT 7;
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