oracle 檢視表結構和注釋

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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