SQL错误：ORA-00932：不一致的数据类型：预期 - 得到CHAR

Question

当我运行这个简单的查询来删除Oracle上的SQL * PLUS中的一行时，我收到错误：

Error report -
SQL Error: ORA-00932: inconsistent datatypes: expected - got CHAR
00932. 00000 -  "inconsistent datatypes: expected %s got %s"
*Cause:    
*Action:

完整代码：

delete from db where TITLE= '<values><value lang="EN">db shared</value></values>'; 

错误：

Error starting at line : 8 in command -
delete from widget_template where TITLE= '<values><value lang="EN">template shared for assets</value></values>'
Error at Command Line : 8 Column : 42
Error report -
SQL Error: ORA-00932: inconsistent datatypes: expected - got CHAR
00932. 00000 -  "inconsistent datatypes: expected %s got %s"
*Cause:    
*Action:

我尝试过这样做：

delete from db where to_char(TITLE)= '<value lang="EN">template shared for all assets</value>';

有了这个，我得到以下错误：

ORA-00932: inconsistent datatypes: expected NUMBER got -
00932. 00000 -  "inconsistent datatypes: expected %s got %s"
*Cause:    
*Action:

PS：这就是TITLE col的样子：

不确定如何解决这个问题。 感谢

Answer 1

错误似乎是由于TITLE列是XMLTYPE这一事实。 如果是这样，这可能是一种方式：

delete from db
where  xmltype.getstringval(TITLE)= '<value lang="EN">template shared for all assets</value>'

Answer 2

您可以使用XMLQuery将XML与您想要的值进行比较，例如使用：

xmlquery('for $i in /values/value[@lang="EN"]
    where $i/text() = "template shared for all assets" return $i'
  passing title returning content)

快速演示：

create table db (id number, title xmltype);
insert into db (id, title) values (1,
  xmltype('<values><value lang="EN">db shared</value></values>'));
insert into db (id, title) values (2,
  xmltype('<values><value lang="EN">template shared for all assets</value></values>'));

select id,
  xmlquery('/values/value[@lang="EN"]/text()' passing title returning content) as title,
  xmlquery('for $i in /values/value[@lang="EN"]
      where $i/text() = "template shared for all assets" return $i/text()'
    passing title returning content) as matched
from db
order by id;

        ID TITLE                               MATCHED                            
---------- ----------------------------------- -----------------------------------
         1 db shared                                                              
         2 template shared for all assets      template shared for all assets     

delete from db
where xmlquery('for $i in /values/value[@lang="EN"]
    where $i/text() = "template shared for all assets" return $i'
  passing title returning content) is not null;

1 row deleted.

select id,
  xmlquery('/values/value[@lang="EN"]/text()' passing title returning content) as title,
  xmlquery('for $i in /values/value[@lang="EN"]
      where $i/text() = "template shared for all assets" return $i/text()'
    passing title returning content) as matched
from db
order by id;

        ID TITLE                               MATCHED                            
---------- ----------------------------------- -----------------------------------
         1 db shared