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