涉及场景
需要查出同一ID下 COLUMN_A字段为数值型的 多条数据 只去COLUMN_A为最小值的那条
SELECT *
FROM (SELECT A.ID,
A.COLUMN_A,
ROW_NUMBER() OVER(PARTITION BY A.ID ORDER BY A.COLUMN_A) AS COUNTNUM
FROM TABLE_NAME A
GROUP BY A.COLUMNNAME)
WHERE COUNTNUM = 1
注: 重点在于此句 ROW_NUMBER() OVER(PARTITION BY A.ID ORDER BY A.COLUMN_A) AS COUNTNUM, 再where里限制下需要的条数就可以实现效果