摘要：SQL> alter table TRIG_SQL_2 modify sqltext blob; alter table TRIG_SQL_2 modify sqltext blob * ERROR at line 1: ORA-22858: invalid alteration of datatype SQL> 解决办法，重建表，用clob字段。
SQL> alter table TRIG_SQL_2 modify sqltext blob;
alter table TRIG_SQL_2 modify sqltext blob
*
ERROR at line 1:
ORA-22858: invalid alteration of datatype
