SQL 错误：ORA-00932：不一致的数据类型：预期 - 得到 CHAR答案

【问题标题】：SQL Error: ORA-00932: inconsistent datatypes: expected - got CHARSQL 错误：ORA-00932：不一致的数据类型：预期 - 得到 CHAR
【发布时间】：2017-02-28 08:17:29
【问题描述】：

当我在 Oracle 上运行此简单查询以删除 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:

我试过了：

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

这样我得到以下错误：

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

PS：这是 TITLE col 的外观：

不知道如何解决这个问题..有什么想法吗？谢谢

【问题讨论】：

TITLE 列的类型是什么？
你确定吗？它似乎是一个 XMLTYPE
你是对的......我的错。

标签： sql oracle

【解决方案1】：

错误似乎是由于TITLE 列是XMLTYPE。如果是这样，这可以是一种方式：

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

【讨论】：

好了，错误消失了，但是当我运行查询时，它说：0 行已删除。

【解决方案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

【讨论】：