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.TABLE_NAME IN (SELECT U.TABLE_NAME FROM USER_ALL_TABLES U)
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
AND A.OWNER = 'PYE'
ORDER BY A.TABLE_NAME, B.COLUMN_ID;另外一些辅助查询：
SELECT * FROM ALL_USERS WHERE USERNAME='PYE'; --查询用户
SELECT * from user_tables where table_name like '%TJ%'; --模糊查询表明
select owner from dba_tables where table_name='TJ_T_TJTCDJB'; --查询表拥有者
select (select a.table_name
from user_constraints a
where a.constraint_name = c.r_constraint_name) 主表表名,
c.r_constraint_name 主表主键键约束名,
c.table_name 从表表名,
c.constraint_name 从表外键约束名
from user_constraints c
where c.constraint_type = 'R'; --查询表的主外键
select * from user_cons_columns --查询表的约束
select * from user_tab_columns --查询表的字段信息
