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cleaning up db of redundant data

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时光说笑
时光说笑 2020-12-07 04:54 
locid   country city
39409   US  Aaronsburg
128426  US  Aaronsburg
340356  US  Aaronsburg
429373  US  Aaronsburg
422717  US  Abbeville
431344  US  Abbeville
433062
5条回答
  • 孤城傲影
    孤城傲影 (楼主)
    2020-12-07 05:33

    delete these recordds

    select T2.* from ( 
     select country city,max(locid)locid
     from 
     group by country city)T1
     join
     select * from 
     T2
     where T2.locid<>T1.locid

    
                                                        
    
              
                
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