SQL Server是否可以在不使用cte的情况下基于排名限制查询结果？

Question

I have been able to successfully use a cte with below SQL that contains rank that gives me output.

WITH cte AS (
   SELECT foo, bar,
   rank() OVER(PARTITION BY foo ORDER BY bar) AS [rank]
   FROM baz)
select * from cte where [rank]=1

My question is can this be done WITHOUT using a cte?

Answer 1

You can use OUTER APPLY as a correlated subquery. This is also known as a LATERAL join or view in some RDBMSs (Oracle, PostgreSQL). It looks like a LEFT JOIN , but it generally performs much better.

Real life example, when to use OUTER / CROSS APPLY in SQL

SELECT pr.name,
       pa.name
FROM   sys.procedures pr
       OUTER APPLY (SELECT TOP 2 *
                    FROM   sys.parameters pa
                    WHERE  pa.object_id = pr.object_id
                    ORDER  BY pr.name) pa
ORDER  BY pr.name,
          pa.name

That question links to an article with several solutions for the "greatest N per group" problem . It doesn't format well for me, but it does seem to be a good article otherwise.