问题描述
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
解决方法
我有一张表,上面有美国每个邮政编码的记录。为了在地图上显示,我需要为每个州选择X个随机记录。我将如何去做呢?