Firebird SQL刪除重複記錄

Question

如何刪除重複記錄？

我使用此查詢，但它刪除太多。

delete from adaparselkomsulari 
where sn not in (select min(sn) 
       from adaparselkomsulari 
       group by sinirtipi, komsuadi); 

我想刪除兩列公用的記錄。

Answer 1

這個怎麼樣

delete from adaparselkomsulari a1 
    where exists(select first 1 1 from adaparselkomsulari a2 
       where a2.sinirtipi = a1.sinirtipi and a2.komsuadi=a1.komsuadi 
       and a1.sn<>a2.sn) 

或

delete from adaparselkomsulari a1 
    where (select count(*) from adaparselkomsulari a2 
       where a2.sinirtipi = a1.sinirtipi and a2.komsuadi=a1.komsuadi)>1