1.oracle中查询某个表中的主键被哪些表引用的sql语句：

SELECT
	c.TABLE_NAME
FROM
	all_constraints p,all_constraints c
WHERE
	p.table_name = '表名'
AND p. OWNER = SYS_CONTEXT ('USERENV','CURRENT_SCHEMA')
AND c. OWNER = SYS_CONTEXT ('USERENV','CURRENT_SCHEMA')
AND c.constraint_type = 'R'
AND p.CONSTRAINT_NAME = c.R_CONSTRAINT_NAME

2.oracle中查询该表中的外键来源于哪些表的sql语句：

SELECT
	cl.table_name
FROM
	user_cons_columns cl
LEFT JOIN user_constraints c ON cl.constraint_name = c.r_constraint_name
WHERE
	c.constraint_type = 'R'
AND c.table_name = '表名'