SQL PLUS FUNCTIONS

I HAVE A TABLE NAMED: EMP
TWO COLUMNS: ENAME AND 1RST_OCCUR.
I MUST FIND THE FIRST OCCURRENCE OF 'L' IN ENAME AND CHANGE IT TO 'X'.
SAMPLE:

ENAME             1RST_OCCUR
--------             ----------------

SMITH                 SMITH
ALLEN                  AXLEN
WARD                  WARD
JONES                 JONES
MARTIN               MARTIN
BLAKE                  BXAKE
CLARK                 CXARK
SCOTT                SCOTT
KING                    KING
TURNER               TURNER
ADAMS                ADAMS
JAMES                 JAMES
FORD                   FORD
MILLER                MIXLER
LVL 1
jheffAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

catchmeifuwantCommented:
This should do the job...

select ename,
case
when instr(ename,'L') > 0 then
substr(ename,1,instr(ename,'L')-1)||'X'||substr(ename,instr(ename,'L')+1)
else
ename
end
from emp
jheffAuthor Commented:
catchmeifuwant,

is it possible to make another command without using case and else?

thanks.
racherCommented:
If you wanted to change all occurences you would use the functions REPLACE or TRANSLATE
As you only want to change the first occurence then you can use INSTR to find the first occurence and then combine that with the use of SUBSTR to get what you want.

ename = SUBSTR(ename, 1, INSTR(ename, 'L' ) -1 ) || 'X' || SUBSTR(ename,INSTR(ename, 'L' ) +1 )

Graham
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

catchmeifuwantCommented:
jheff,


here is an other one using decode...the logic is same as Case When End

select ename,
decode(instr(ename,'L'),0,substr(ename,1,instr(ename,'L')-1)||'X'||substr(ename,instr(ename,'L')+1),ename)
from emp
Bigfam5Commented:
catchmeifuwant you almost had it, except that your returns an extra X in front of the names that do not contain an L

Try this instead

select ename,INSTR(ename, 'L' ),
       decode ( INSTR(ename, 'L'),
                0, ename,
                substr(ename,1, INSTR(ename, 'L' )-1)
                || 'X' ||
                substr(ename, INSTR(ename, 'L' )+1 ) )
 from emp;



Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
catchmeifuwantCommented:
:-) Thanks for pointing it out...jumbled the ename and substr !!!
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Oracle Database

From novice to tech pro — start learning today.