Oracle常用查看表结构命令

Oracle常用查看表结构命令

表名，用户名什么的要大写 ！ 切记



获取表：

select table_name from user_tables; //当前用户的表      

select table_name from all_tables; //所有用户的表  

select table_name from dba_tables; //包括系统表

select table_name from dba_tables where owner='用户名'

user_tables：

table_name,tablespace_name,last_analyzed等

dba_tables：

ower,table_name,tablespace_name,last_analyzed等

all_tables：

ower,table_name,tablespace_name,last_analyzed等

all_objects：

ower,object_name,subobject_name,object_id,created,last_ddl_time,timestamp,status等

获取表字段：

select * from user_tab_columns where Table_Name='用户表';

select * from all_tab_columns where Table_Name='用户表';

select * from dba_tab_columns where Table_Name='用户表';

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

获取表注释：

select * from user_tab_comments

user_tab_comments：table_name,table_type,comments

--相应的还有dba_tab_comments，all_tab_comments，这两个比user_tab_comments多了ower列。

获取字段注释：

select * from user_col_comments

user_col_comments：table_name,column_name,comments





select b.TABLE_NAME as "表名",
       c.comments as "表说明",
       b.COLUMN_ID as "字段序号",
       b.COLUMN_NAME as "字段名",
       b.DATA_TYPE as "字段数据类型",
       b.DATA_LENGTH as "数据长度",
       b.DATA_PRECISION as "整数位",
       b.DATA_SCALE as "小数位",
       a.comments as "字段说明"
  from all_col_comments a, all_tab_columns b,all_tab_comments c
where a.owner = 'BICP' and a.owner = b.OWNER And
       a.table_name = b.TABLE_NAME and a.column_name = b.COLUMN_NAME And
       c.table_name = a.table_name and c.owner = a.owner
order by a.table_name, b.COLUMN_ID