解决方法
优选使用
virtual columns
create table t2( col_name varchar2(10) ); insert into t2(col_name) values('hsaJDadkD'); ALTER TABLE t2 ADD (col_name2 GENERATED ALWAYS AS (SUBSTR(col_name,-3))); --virtual column Select * from T2; COL_NAME COL_NAME ---------- -------- hsaJDadkD dkD