Question

How do i do a where clause to check the age show below when i don’t have an age field to check it against? I’m using oracle DB.

select LNAME || ', ' || FNAME as "Name", 
       TO_CHAR(sysdate,'YYYY') - TO_CHAR(DOB,'YYYY') as AGE 
  from STAFF
 where AGE = (select min(TO_CHAR(sysdate,'YYYY') - TO_CHAR(DOB,'YYYY')) 
                from STAFF);

Answer 1

Here’s some example on existing Oracle table:

SELECT * FROM 
(
 SELECT ename as "Name"
      , TO_CHAR(sysdate,'YYYY') - TO_CHAR(hiredate,'YYYY') as AGE 
  FROM scott.emp
)
WHERE age = (SELECT min(TO_CHAR(sysdate,'YYYY') - TO_CHAR(hiredate,'YYYY')) FROM scott.emp)
/

Name    AGE
----------------
SCOTT   26
ADAMS   26

You may also add analytic functions to partition by age or any other field for example or simply order by age asc to see all emps in output removing where…