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- SELECT duck_weight 'duckWeight',duck_num 'duckNum',call_date 'callDate',Round(avg(duck_weight),2) avgWeight FROM `env_regular_call_feeding`
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+ SELECT (IFNUll(sum(duck_weight),'0')) 'duckWeight' ,duck_num 'duckNum',call_date 'callDate',Round(avg(duck_weight),2) avgWeight FROM `env_regular_call_feeding`
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