Need help on Regular expression and query

Question

Hi Guru's, Hope you all are doing great!.
I have a scenario's where i need do insert the data into table.
I have three scenarios :
select 'Kodali,Raj,S' str from dual
union
select 'Alex Romano' from dual
union
select 'ppppp' from dual
Alex Romano
Kodali,Raj,S
pppppNow what i want is .
1. Alex Romano
if there is space between the string then i want to insert into first name and last name columns
2. Kodali,Raj,S
if its a comma between the string then i want to insert into last name , first name and middle name
3. if there is only one string then same insert into first name and last name.
I wrote the query earlier to handle only comma and now i am trying but not able to use this all scenarios
Can you please help me out.
WITH t AS (
select 'Kodali,Raj,S' str from dual
union
select 'Alex Romano' from dual
union
select 'ppppp' from dual
select DECODE(trim(a),NULL,'a',trim(a)),DECODE(trim(b),NULL,'b',trim(b)),decode(trim(c),NULL,'c' ,trim(c))
from
  SELECT max(decode(level,1,regexp_substr(str,'[^,]+',1,level))) a --INTO lFNAME
          , max(decode(level,2,regexp_substr(str,'[^,]+',1,level))) b --INTO lLNAME
          , max(decode(level,3,regexp_substr(str,'[^,]+',1,level))) c --INTO lMNAME      
   FROM   t
  CONNECT BY regexp_substr(str,'[^,]+',1,level) IS NOT NULL
  GROUP BY str
) ;Currently i am putting a b and c if its null.
Thanks in advance!

Answer 1

user590978 wrote:
Hi Guru's, Hope you all are doing great!.
I have a scenario's where i need do insert the data into table.
I have three scenarios :
select 'Kodali,Raj,S' str from dual
union
select 'Alex Romano' from dual
union
select 'ppppp' from dual
Alex Romano
Kodali,Raj,S
pppppNow what i want is .
1. Alex Romano
if there is space between the string then i want to insert into first name and last name columns
2. Kodali,Raj,S
if its a comma between the string then i want to insert into last name , first name and middle name
3. if there is only one string then same insert into first name and last name.
I wrote the query earlier to handle only comma and now i am trying but not able to use this all scenarios
Can you please help me out.
WITH t AS (
select 'Kodali,Raj,S' str from dual
union
select 'Alex Romano' from dual
union
select 'ppppp' from dual
select DECODE(trim(a),NULL,'a',trim(a)),DECODE(trim(b),NULL,'b',trim(b)),decode(trim(c),NULL,'c' ,trim(c))
from
SELECT max(decode(level,1,regexp_substr(str,'[^,]+',1,level))) a --INTO lFNAME
, max(decode(level,2,regexp_substr(str,'[^,]+',1,level))) b --INTO lLNAME
, max(decode(level,3,regexp_substr(str,'[^,]+',1,level))) c --INTO lMNAME      
FROM   t
CONNECT BY regexp_substr(str,'[^,]+',1,level) IS NOT NULL
GROUP BY str
) ;Currently i am putting a b and c if its null.
Thanks in advance!It's never a popular suggestion, but why not fix the design to begin with?
It's the year 2013, can a client not pass you a "complex" data structure consisting of first, middle and last name?
Why rely on an unreliable construct when there are so many more usable way to achieve this?
Cheers,