有时候要改改表字段的某些精度，可能一多就不确定是否改全了，Oracle支持搜索table,字段,对象等统计信息

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,b.column_id;

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