SQL Server - 每个状态提取X个随机记录

Question

我有一张表，其中包含美国各邮政编码的记录。为了在地图上显示，我需要为每个州选择X个随机记录。我该怎么做呢？

Answer 1

使用：

WITH sample AS (
 SELECT t.*,
        ROW_NUMBER() OVER (PARTITION BY t.state
                               ORDER BY NEWID()) AS rank
   FROM ZIPCODES t)
SELECT s.*
  FROM sample s
 WHERE s.rank <= 5

Answer 2

SELECT * FROM ZipCodes ORDER BY NEWID()