with a as ( select '1月' month_code,1 as month_number union all select '2月',2 union all select '3月',3 union all select '4月',4 union all select '5月',5 union all select '6月',6 union all select '7月',7 union all select '8月',8 union all select '9月',9 union all select '10月',10 union all select '11月',11 union all select '12月',12 ) select a.month_code,b.* from a left join (SELECT month_code,/*业务月份*/ amount from 订单表 ) b on a.month_code=b.month_code order by a.month_number/*排序用的*/ 自己改
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