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('tc_plantask') ;
獲取表：
select table_name from user_tables; //當前用戶的表 table_name,tablespace_name,last_analyzed等
select table_name from all_tables; //所有用戶的表 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='用戶名'
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='用戶表';
select * from all_tab_columns where Table_Name='用戶表';
select * from dba_tab_columns where Table_Name='用戶表';
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