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      2                6
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      1      60      20
      1      60      30
      2      11      5
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11 = 5+6
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--> Title : Generating test data
--> Author : wufeng4552
--> Date : 2010-02-10 15:58:02

if not object_id('tb') is null
drop table tb
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Create table tb([A] int,[B] int,[C] int)
Insert tb
select 1,null,10 union all
select 1,


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