CODEWITHSUNDEEP
sqlxmloracle-database
Urbi
Urbi

Reputation: 125

How to get dummy value for XML empty tag in table using Oracle?

select a.test 
from demotable b
    ,XMLTable('//test' passing xmltype(b.xmlTagColumn) columns test varchar(10) path '.') a

b.xmlTagColumn has xml content. If b.xmlTagColumn has <test></test> then I am not getting anything from above statement not even null. How can I get null or dummy value for empty tag?

Upvotes: 1

Views: 1235

Answers (1)

David דודו Markovitz
David דודו Markovitz

Reputation: 44921

left join ... on 1=1

select  a.test 

from                demotable b 

        left join   XMLTable
                    (
                        '//test' 
                        passing xmltype(b.xmlTagColumn) 
                        columns 
                            test varchar(10) path '.'
                    ) a 

        on         1=1
;

Demo

create table demotable (id int,xmlTagColumn varchar2(100));

insert into demotable (id,xmlTagColumn) values (1,'<X><test>123</test></X>');
insert into demotable (id,xmlTagColumn) values (2,'<Y><test>456</test></Y>');
insert into demotable (id,xmlTagColumn) values (3,'<Z><prod>123</prod></Z>');

select  b.id
       ,a.test 

from                demotable b 

        left join   XMLTable
                    (
                        '//test' 
                        passing xmltype(b.xmlTagColumn) 
                        columns 
                            test varchar(10) path '.'
                    ) a 

        on         1=1
;        

+----+--------+
| ID | TEST   |
+----+--------+
| 1  | 123    |
+----+--------+
| 2  | 456    |
+----+--------+
| 3  | (null) |
+----+--------+

Upvotes: 1

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