need help on sql query

Hi ,

I have an table called customer with the below structure.

customer_id
is_internal
is_external
is_vip


The fields is_internal, is_external,is_vip store values like Y or N.

My requirement is I need to check these fields for each customer Id , and sort them by concantenating values present in is_internal, is_external,is_vip.


for example
customer id         Is_internal is_external is_vip                   customer type
1                                Y                 Y               Y                           internal,external,vip
2                                Y                 Y              N                           internal,external
3                                Y                N              Y                            internal, vip
4                                N               Y               Y                            external, vip
5                               N               Y                N                           external
6                               N              N               Y                              vip

i must write an query which fetches the results as in customer_id , customer_type
and sort based on customer_type.

Select customer_id ,
case when is_internal ='Y' and is_external='Y' and is_vip='Y' then
      'INTERNAL'||','||'EXTERNAL'||','||'VIP'
when is_internal ='Y' and is_external='Y' and is_vip='N' then
      'INTERNAL'||','||'EXTERNAL'
when is_internal ='Y' and is_external='N' and is_vip='N' then
      'INTERNAL'
WHEN is_internal ='Y' and is_external='N' and is_vip='Y' then
      'INTERNAL'||','||'VIP'
When is_internal ='N' and is_external='N' and is_vip='Y' then
      'VIP'
when is_internal ='N' and is_external='Y' and is_vip='Y' then  
'EXTERNAL'||'VIP'
when is_internal ='N' and is_external='Y' and is_vip='N' then
'EXTERNAL'
end customertype
from customer
order by 2 asc

Is there an better approach to this requirement.  can I use list_agg function to achive the result.

Any help is really appreciated.
sam_2012Asked:
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MikeOM_DBACommented:
Use DECODE() function:
. . . DECODE(is_internal, 'Y','INTERNAL,','')||DECODE(is_external,'Y','EXTERNAL,','')||DECODE(is_vip,'Y','VIP')

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sam_2012Author Commented:
when only is_internal is true , Iam getting INTERNAL, . I do not want the , to be appended , if only one condition is satisfied

For example :
is_internal="Y' and is_external='N' and is_vip='N'

it should display only INTERNAL and not INTERNAL,
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MikeOM_DBACommented:
And is it too difficult for you to remove the trailing comma?

HINT: Use the RTRIM() function.
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sam_2012Author Commented:
thanks a lot.
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