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select 1 as a ,2 as b ,a-b as c from dual

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where a.exec_sqn = b.exec_sqn 
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id  name(nvarchar2(200))
1    a1
2    a2
3    a3
1    b1
3    b3
1    c1

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connStr="Provider=OraOLEDB.Oracle;User ID=scott;Password=tiger;Data Source=192.168.0.120;";
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