查找表的父表和子表

select zi.table_name,zi.column_name,fu.table_name,fu.column_name
from  user_cons_columns zi
join user_constraints b on zi.constraint_name=b.constraint_name and zi.table_name=b.table_name
join user_cons_columns fu on b.r_constraint_name = fu.constraint_name
where b.constraint_type = 'R' and fu.table_name= '总表';

如果查询其他用户下的数据字典可以用all_cons_columns和all_constraints。

SQL> desc user_cons_columns;
  Name                                      Null?    Type
  ----------------------------------------- -------- ------------------------
  OWNER                                     NOT NULL VARCHAR2(30)
  CONSTRAINT_NAME                           NOT NULL VARCHAR2(30)
  TABLE_NAME                                NOT NULL VARCHAR2(30)
  COLUMN_NAME                                        VARCHAR2(4000)
  POSITION                                           NUMBER

SQL> desc user_constraints;
  Name                                      Null?    Type
  ----------------------------------------- -------- ------------------------
  OWNER                                     NOT NULL VARCHAR2(30)
  CONSTRAINT_NAME                           NOT NULL VARCHAR2(30)---约束名
  CONSTRAINT_TYPE                                    VARCHAR2(1)
  TABLE_NAME                                NOT NULL VARCHAR2(30)
  SEARCH_CONDITION                                   LONG
  R_OWNER                                            VARCHAR2(30)
  R_CONSTRAINT_NAME                                  VARCHAR2(30)---若CONSTRAINT_TYPE=R，则是外键约束关联的主表的主键名
  DELETE_RULE                                        VARCHAR2(9)
  STATUS                                             VARCHAR2(8)
  DEFERRABLE                                         VARCHAR2(14)
  DEFERRED                                           VARCHAR2(9)
  VALIDATED                                          VARCHAR2(13)
  GENERATED                                          VARCHAR2(14)
  BAD                                                VARCHAR2(3)
  RELY                                               VARCHAR2(4)
  LAST_CHANGE                                        DATE
  INDEX_OWNER                                        VARCHAR2(30)
  INDEX_NAME                                         VARCHAR2(30)
  INVALID                                            VARCHAR2(7)
  VIEW_RELATED                                       VARCHAR2(14)

 select z.table_name,z.column_name, z.constraint_name from user_cons_columns z join user_constraints b on b.TABLE_NAME=z.TABLE_NAME 
 where b.R_CONSTRAINT_NAME='PK_参数表';

--父表
select b.table_name from user_constraints a join user_cons_columns b on a.r_constraint_name=b.constraint_name where a.table_name='总表';