oracle中怎麼查詢各組中最新的一條記錄呢?比如說現在有一個表中幾條資料如下:

有兩種寫法:
寫法一:over partition by 分析函式

SELECT * FROM  (select ID_,COMPANY_NAME,USAGE_RATE,DETECTION_RATE,ACCEPTABILITY_RATE,CREATE_TIME,MAX(CREATE_TIME) over(partition by COMPANY_NAME) 
 as  "atime" from SPEC_RATE_ORIGIN) x where CREATE_TIME = "atime";
 

寫法二:inner join

SELECT A.* FROM SPEC_RATE_ORIGIN A INNER JOIN (SELECT COMPANY_NAME,MAX(CREATE_TIME) AS "atime" 
FROM SPEC_RATE_ORIGIN group by COMPANY_NAME) B ON A.COMPANY_NAME = B.COMPANY_NAME AND A.CREATE_TIME = B."atime";

查詢結果為: