1.insert into `table` (con1,con2) select con1,con2 from `table2`;   从order2读取数据读入sign，其中position没有相应字段，统一输入position,city插入空值，

insert into `sign`(name,tel,weixin,email,position,source,ip,city,addtime) select name,tel,wechat,email,‘position‘,source,ip,‘‘,addtime from `order2`;

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