Selceting and updating records oracle
Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. You can use a subquery to apply the aggregate function to return the select s1. It is important to pay close attention to your partitioning and ordering in the over() clause.Visit Stack Exchange Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Sign up to join this community column which has a unique value for both entries. SELECT DISTINCT FIRST_VALUE(LAST_UPDATE_DATE_TIME) OVER (PARTITION BY SCHOOL_CODE ORDER BY LAST_UPDATE_DATE_TIME DESC) AS LAST_UPDATE , FIRST_VALUE(SCHOOL_CODE) OVER (PARTITION BY SCHOOL_CODE ORDER BY LAST_UPDATE_DATE_TIME DESC) AS SCHOOL_CODE , FIRST_VALUE(PERSON_ID) OVER (PARTITION BY SCHOOL_CODE ORDER BY LAST_UPDATE_DATE_TIME DESC) AS PERSON_ID FROM SCHOOL_STAFF WHERE STAFF_TYPE_NAME = 'Principal' ORDER BY SCHOOL_CODE select LAST_UPDATE_DATE_TIME as LAST_UPDATE, SCHOOL_CODE, PERSON_ID from SCHOOL_STAFF WHERE STAFF_TYPE_NAME='Principal' AND LAST_UPDATE_DATE_TIME = (SELECT MAX(LAST_UPDATE_DATE_TIME) FROM SCHOOL_STAFF s2 WHERE PERSON_ID = s2. LAST_UPDATE_DATE_TIME; select SCHOOL_CODE, PERSON_ID, LAST_UPDATE_DATE_TIME from ( select SCHOOL_CODE, PERSON_ID, LAST_UPDATE_DATE_TIME, row_number() over(partition by SCHOOL_CODE order by LAST_UPDATE_DATE_TIME desc) seq from SCHOOL_STAFF where STAFF_TYPE_NAME='Principal' ) d where seq = 1; select SCHOOL_CODE, PERSON_ID, LAST_UPDATE_DATE_TIME from ( select SCHOOL_CODE, PERSON_ID, LAST_UPDATE_DATE_TIME, rank() over(partition by SCHOOL_CODE order by LAST_UPDATE_DATE_TIME desc) seq from SCHOOL_STAFF where STAFF_TYPE_NAME='Principal' ) d where seq = 1; CREATE TABLE SCHOOL_STAFF ( LAST_UPDATE_DATE_TIME VARCHAR(20), SCHOOL_CODE VARCHAR(20), PERSON_ID VARCHAR(20), STAFF_TYPE_NAME VARCHAR(20) ); INSERT INTO SCHOOL_STAFF VALUES ('24-JAN-13', 'ABE', '111222', 'Principal'); INSERT INTO SCHOOL_STAFF VALUES ('09-FEB-12', 'ABE', '222111', 'Principal'); The OVER() clause creates a window for which you will define your aggregate groups.
There is a date column in the table but if I use it the query takes lots of time to finish as I got millions of records in the table... Some companies count on you returning with requests for customizations of the software.Now that you have the software and have spent significant time purchasing hardware and dedicating resources, they know you are already, “half way in the pool”; they also know that you will have trouble refusing to pay extra money to get what you want.These services can include anything from training classes, customizations, or help with installation issues.In the case of local software companies, keep in mind, they should automatically provide some sort of on-site services (at a minimum) before purchasing.