SQLクエリで次の行を見つけ、前の行が一致する場合にのみ削除する

 with C as( select ID, row_number() over(order by DT) as rn from YourTable)delete C1 from C as C1 inner join C as C2 on C1.rn =C2.rn-1 and C1. ID =C2.ID  

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