列整合一例

数据如下

要求提取，非空字段。

表总行数

实现

SELECT MAX(title) title ,MAX(URL) URL,MAX(time) time,MAX(CONTENT ) CONTENT   FROM 
 (
SELECT NTILE ((SELECT COUNT(*)  FROM  test )/4)   OVER ( ORDER BY id) AS gid,*  FROM  test

 
 ) result 
 
GROUP BY gid