删除SQL中的重复记录

Question

我有这个SQL查询来选择所有没有订单的重复客户：

{{1}}

如何更改此查询以删除这些客户？

感谢您的帮助

Answer 1

delete from [KUNDEN]
where nummer in (
    select distinct nummer
    from [KUNDEN] k1
    where not exists (
    select * from [BELEG] b
    where k1.Nummer = b.Adressnummer)
    and exists (
    select * from [KUNDEN] k2
    where k1.Nummer <> k2.Nummer
    and k1.Name = k2.Name
    and k1.Vorname = k2.Vorname)
)