oracle怎么查询外键所在表

```sql

SELECT

UC.CONSTRAINT_NAME AS FOREIGN_KEY_NAME,

UC.TABLE_NAME AS CHILD_TABLE,

UCC.COLUMN_NAME AS CHILD_COLUMN,

UR.TABLE_NAME AS PARENT_TABLE,

UCR.COLUMN_NAME AS PARENT_COLUMN

FROM

USER_CONSTRAINTS UC

JOIN

USER_CONS_COLUMNS UCC ON UC.CONSTRAINT_NAME = UCC.CONSTRAINT_NAME

JOIN

USER_CONSTRAINTS UR ON UC.R_CONSTRAINT_NAME = UR.CONSTRAINT_NAME

JOIN

USER_CONS_COLUMNS UCR ON UR.CONSTRAINT_NAME = UCR.CONSTRAINT_NAME

WHERE

UC.CONSTRAINT_TYPE = 'R'

AND UC.TABLE_NAME = 'YOUR_TABLE_NAME';

```

在这个查询中，将会列出指定表中的外键约束的名称，子表名，子表外键列名，父表名和父表外键列名。您可以将'YOUR_TABLE_NAME'替换为您想要查询外键的表名。