select
t1.table_name,
t1.column_name,
t1.data_type || '(' || t1.data_length || ')',
t2.comments
from
user_tab_cols t1,
user_col_comments t2
where
t1.table_name = t2.table_name
and t1.column_name = t2.column_name
and t1.table_name = upper( 'tb_role' );
獲取表：
select table_name from user_tables; //當前使用者的表 table_name,tablespace_name,last_analyzed等
select table_name from all_tables; //所有使用者的表 ower,table_name,tablespace_name,last_analyzed等
select table_name from dba_tables; //包括系統表 ower,table_name,tablespace_name,last_analyzed等
select table_name from dba_tables where owner='使用者名稱'
all_objects：
ower,object_name,subobject_name,object_id,created,last_ddl_time,timestamp,status等
獲取表字段：
select * from user_tab_columns where table_name='使用者表';
select * from all_tab_columns where table_name='使用者表';
select * from dba_tab_columns where table_name='使用者表';
user_tab_columns：
table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等
all_tab_columns ：
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等
dba_tab_columns：
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等
獲取表注釋：
select * from user_tab_comments
user_tab_comments：table_name,table_type,comments
--相應的還有dba_tab_comments，all_tab_comments，這兩個比user_tab_comments多了ower列。
獲取字段注釋：
select * from user_col_comments
user_col_comments：table_name,column_name,comments
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