mysql生成一段時間的日期並插入表格，做爲維護日期表

set @i = -1;      set @sql = repeat(" select 1 union all",-datediff('2017-09-01','2020-09-01')+1);      set @sql = left(@sql,length(@sql)-length(" union all"));      set @sql = concat(" INSERT into  f

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