SQL Server - 爲每個州提供X個隨機記錄

Question

我有一個包含美國各個郵政編碼的記錄表。爲了在地圖上顯示，我需要爲每個狀態選擇X個隨機記錄。我會如何去做這件事？

Answer 1

用途：

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()