ora-904 rowid create materialized view

create materialized view t_v as
select t1.*,1 as marker,rowid from t1 t1
union all
select t2.*,2 as marker,rowid from t2 t2;

ORA-00904: "ROWID" invalid identifier

经查询，第一个rowid必须设置一个别名，如下：

create materialized view t_v as
select t1.*,1 as marker,rowid as rid from t1 t1
union all
select t2.*,2 as marker,rowid from t2 t2;

问题解决。

注：也有可能会在refresh的时候出现ora-904，可参考：https://oracleblog.org/working-case/ora920-when-refresh-mview/