场景一个起租单可能对应多条附件,通过起租单id关联Select 起租单id,附件id from 起租单表 left join 附件表 on 起租单id = 附件id
原以为left join出现1对多时,左表只会select出一条数据,但是现实是会造成左表重复数据的产生。
修正方法:不要求查询右表所 ...
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