用正则表达式定位引起ORA-01722: 无效数字的问题数据
在执行SQL时,比如大批量数据转移时,经常会遇到无效数字的问题,如何快速定位到时那个字段那个值?这个问题的原因是varchar2转number出错,用正则表达式可以快速定位出问题数据,下面来做个例子:
SQL> drop table test purge;
SQL> create table test as select * from dba_objects;
SQL> update test set subobject_name=object_id;
SQL> update test set subobject_name='gg' where rownum<5;
SQL> commit;
SQL> select count(1) from test where subobject_name=object_id;
select count(1) from test where subobject_name=object_id
*
第 1 行出现错误:
ORA-01722: 无效数字
SQL> select subobject_name, object_id
2 from test
3 where not regexp_like(subobject_name, '[[:digit:]]');
SUBOBJECT_NAME OBJECT_ID
------------------------------ ----------
gg 20
gg 44
gg 28
gg 15