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mysql 如何sum 求和
select sum([value]-[fee]*100) from pos where user=1一般用SQL语句求和的格式是:select sum(column_name) from db_name where search_cond
select sum([value]-[fee]*100) from pos where user=1一般用SQL语句求和的格式是:select sum(column_name) from db_name where search_cond