MySQL - Transform simple table -

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It sounds easy, but I think there may be several steps to get this. Is there any easy way to do this?

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You are looking for aggregation tasks, in particular, group_concat () . The key is that you want to do two aggregations: 

  select subgroup combo, number as number (*), sum (expense) as the total amount, amount in the form of total transaction (Transaction) as customer (group of subgroups) subgroupcombo, amount as expense (expenditure), amount (transactions) by customer as input i group) group group by subgroupcombo ;

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