Sqlserver：
create trigger tr_A
on A for delete as
begin
delete B from B,deleted D where B.id=D.id
end
Oracle：
Create Or Replace Trigger tr_A
After Delete On A
For Each Row
Begin
Delete From B Where id=:Old.id;
End;
假设主键为 ID
上面的不错，可以试试，他回答了我就不说了
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