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