Sometimes it is necessary to change some precisions of table fields, and you may not be sure whether to change all of them. Oracle supports searching for statistical information such as tables, fields, objects, etc.

 select a.owner, a.table_name, b.column_name,b.data_precision || ',' ||b.data_scale
      from dba_tables a, dba_tab_columns b, dba_objects c
     where a.owner = b.owner
       and a.table_name = b.table_name
       and a.table_name = c.object_name
       --and a.owner in ('XXX') --用户可选
       --and b.data_type in ('VARCHAR2','CHAR','NCHAR','NCLOB','NVARCHAR2','NUMBER','DATE','TIMESTAMP%','FLOAT')
       and c.object_type = 'TABLE'
       and  upper(b.column_name) like '%BG_NUM%'
       order by a.owner,a.table_name,b.column_id;