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    t1        t2
-----------------------
    111        1
    121        1
    125        2
    234        2
    211        2
    762        3
    154        4
........................
 
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    sum_t1    t2
      232      1
      270      2
      762      3
.....................

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select t2,sum(t1) as sum_t1 from t group by t2

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SQL code:
select sum(t1)as sum_t1,t2 from t group by t2


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    t1        t2        t3
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    111        1        &


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