ORA-00932: inconsistent datatypes: expected - got CLOB

我已经阅读了很多关于同样的错误的问题，但没有一个运行从sqlPLUS直接查询

UPDATE IMS_TEST 
       SET TEST_Category  = 'just testing'  
     WHERE TEST_SCRIPT    = 'something'
       AND ID             = '10000239'

完整示例：

sql> create table ims_test(
  2  test_category varchar2(30),3  test_script clob,4  id varchar2(30)
  5  );

Table created.

sql> insert into ims_test values ('test1','something','10000239');

1 row created.

sql> UPDATE IMS_TEST
  2  SET TEST_Category  = 'just testing'
  3  WHERE TEST_SCRIPT    = 'something'
  4  AND ID             = '10000239';
WHERE TEST_SCRIPT    = 'something'
      *
ERROR at line 3:
ORA-00932: inconsistent datatypes: expected - got CLOB

UPDATE IMS_TEST 
   SET TEST_Category           = 'just testing'  
 WHERE to_char(TEST_SCRIPT)    = 'something'
   AND ID                      = '10000239';