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insert into a values('b1',10)
insert into a values('b2',20)
insert into a values('b3',30)
insert into b values('b1',1)
insert into b values('b2',2)
insert into b values('b2',3)
insert into b values('b3',4)
insert into b values('b4',5)
insert into b values('b4',6)

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    select a.barcode,a.length,b.serial from a,b where a.barcode=b.barcode
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    barcode  length    serial
      b1        10        1
      b2        20        2
      b2        20        3
      b3        30        4
      b3        30        5
      b3        30        6

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    barcode  length    serial
      b1        10        1
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