您可以在以下位置创建触发器table [用户]监视何时删除该表中的寄存器。因此，您检查删除是否为userId：1，然后不删除它，否则..删除它，这里是代码：

You can create a Trigger on table [Users] that watch when a register from this table is being deleted. So you check if deletion is userId:1 then you don't delete it, else.. you delete it, here is the code:

CREATE TRIGGER sampleTrigger
    ON [Users]
    INSTEAD OF DELETE
AS
    IF EXISTS(SELECT * FROM deleted WHERE idUser IN (1))
    BEGIN
        RAISERROR ('Is not allowed to delete idUser: 1',16, 1)  
    END
    ELSE
    BEGIN
        DELETE [Users] WHERE idUser IN (SELECT idUser FROM deleted)
    END
GO