外鍵查詢

1.查詢該表的主鍵被那些表作爲外鍵使用：

SELECT B.TABLE_NAME 
FROM ALL_CONSTRAINTS A, ALL_CONSTRAINTS B
WHERE A.TABLE_NAME = '表名'
 AND A.OWNER = SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA')
 AND B.OWNER = SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA')
 AND B.CONSTRAINT_TYPE = 'R'
 AND A.CONSTRAINT_NAME = B.R_CONSTRAINT_NAME;

2.查詢該表引用了那些表的主鍵作爲外鍵：

SELECT A.TABLE_NAME
FROM USER_CONS_COLUMNS A
LEFT JOIN ALL_CONSTRAINTS B
 ON A.CONSTRAINT_NAME = B.R_CONSTRAINT_NAME
WHERE B.CONSTRAINT_TYPE = 'R'
 AND B.TABLE_NAME = '表名';

替換其中的‘表名’即可。