Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 771
  • Last Modified:

to concatenate with Null

Hi,
a question,

in a table I have two Fields, ID_PESSOA and ID_PESSOA_PAI.
in some cases, the field ID_PESSOA_PAI is null.

How can I make to concatenate the two fields, and case the field ID_PESSOA_PAI is null, return only ID_PESSOA ????

ex:
P.ID_PESSOA = 10;
P.ID_PESSOA = 20;
(P.ID_PESSOA || ' \ ' || P.ID_PESSOA_PAI) PATH
PATH = 10 \ 20;

P.ID_PESSOA = 10;
P.ID_PESSOA_PAI = null;
(P.ID_PESSOA || ' \ ' || P.ID_PESSOA_PAI) PATH
PATH = 10 \;


Thank's
Rafael Schardosin
Porto Alegre - Brazil


0
schardosin
Asked:
schardosin
1 Solution
 
Gary BenadeCommented:
There may be other ways, but all I can think of is this. I hope I understood your question correctly....

select cast( P.ID_PESSOA || ' \ ' || P.ID_PESSOA_PAI as char(25)) result_str from test
where P.ID_PESSOA is not null and P.ID_PESSOA_PAI is not null
union all
select cast( P.ID_PESSOA as char(25)) result_str from test
where P.ID_PESSOA is not null and P.ID_PESSOA_PAI is null
union all
select cast( P.ID_PESSOA_PAI as char(25)) result_str from test
where P.ID_PESSOA is null and P.ID_PESSOA_PAI is not null

Regards
Gary
0
 
Gary BenadeCommented:
When I re-read your question, I saw that only P.ID_PESSOA_PAI could be NULL, so you can shorten the above to this.

select cast( P.ID_PESSOA || ' \ ' || P.ID_PESSOA_PAI as char(25)) result_str from test
where P.ID_PESSOA_PAI is not null
union all
select cast( P.ID_PESSOA as char(25)) result_str from test
where P.ID_PESSOA_PAI is null
0
 
schardosinAuthor Commented:
Thank´s,

but the solution more optimized is other,
reading the Firebird Help I  get the following solution:
select
CASE WHEN PP.ID_PESSOA is null then P.ID_PESSOA ELSE PP.ID_PESSOA || ' \ ' || P.ID_PESSOA END PATH
from
  V_PESSOA P left outer join
  V_PESSOA PP on PP.ID_PESSOA = P.ID_PESSOA_PAI


Thank´s
Rafael Schardosin
Porto Alegre - Brazil
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
Gary BenadeCommented:
I have never heard of the Select CASE statement for FB 1.0.x? Must be a new 1.5 feauture...

Surely all you need to do is

select
CASE WHEN P.ID_PESSOA_PAI is null then P.ID_PESSOA ELSE P.ID_PESSOA || ' \ ' || P.ID_PESSOA_PAI END PATH
from
  V_PESSOA P

Why the join??
0
 
schardosinAuthor Commented:
sorry,

in a view V_PESSOA for table PESSOA, the field ID_PESSOA_PAI is Daddy of the ID_PESSOA.
to bring the name(field NOME) of ID_PESSOA and ID_PESSOA_PAI, I make a bond between ID_PESSOA_PAI (V_PESSOA P) and ID_PESSOA (V_PESSOA PP) for bring in only one select the name of ID_PESSOA and your Daddy, ID_PESSOA_PAI.

translation.
PAI = DADDY
PESSOA = PEOPLE
NOME = NAME

Rafael Schardosin
Porto Alegre - Brazil
0
 
BAlexandrovCommented:
If you use firebird, the most correct is to use Coalesce - this is the Ansi standart function

(P.ID_PESSOA || ' \ ' || coalesce(P.ID_PESSOA_PAI,''))


Bojidar Alexandrov
0
 
schardosinAuthor Commented:
thank´s

your solution was of great help!!!


Rafael Schardosin
Porto Alegre - Brazil
0
 
vowcaCommented:
0
 
kacorretiredCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area for this question:
       to accept BAlexandrov's answer
Please leave any comments here within the next four (4) days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

If you will get a useful answer to your newer question next time, please accept it after evaluating. By this way the experts will get sooner his expert points for supporting you. If you have question about, please look at  http://www.experts-exchange.com/help.jsp.

kacor
EE Cleanup Volunteer
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now