可以通过使用 order by 子句使用视图插入数据吗？

Question

During my interview for the position of SQL Developer the interviewer asked me one question

It is possible to insert data using views including order by clause?

I answered to the interviewer "No it is not possible". But she told that it is possible. I searched through internet but I couldn't get the solution.

So, kindly give me the solution.

Answer 1

You can not create the view with order by (unless some limit clause is used) but you can use the order by when selecting from view and insert into table using the insert into.. select.. order by..

insert into test(t_col)
select vw_col from vw order by vw_col

Db<>fiddle example

Answer 2

If you are phrasing the question correctly, I would say you are correct for the following reasons:

1. Views do only allow order by clauses except with very limited exceptions.
2. Views can be arbitrary queries, and hence most views are not "insertable" (the real term is updatable ).

There are specific exceptions to each of these. For instance, you can use select top 100 percent in a view that has a query with an order by . However, that doesn't mean that the view is "ordered". Simply that the top 100% of rows based on the order by are returned.

Similarly, there are some views that are insertable. In general, though, you would need to write an insert trigger on a view to insert into it.

Hmmm. . . I guess the answer might be "yes", but only under very limited and specific circumstances. Here is an example where it actually works. But to be honest, I think "no" illustrates better knowledge of SQL Server unless you are answering an essay question.