目前发布的版本不支持外键，据了解下个版本会支持

postgres=# CREATE TABLE p_test(pid INT PRIMARY KEY);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "p_test_pkey" for table "p_test"
CREATE TABLE
postgres=# CREATE TABLE c_test(cid INT,pid INT,CONSTRAINT fk_pid_c_test_p_test FOREIGN KEY (pid) REFERENCES p_test(pid));
ERROR:  FOREIGN KEY ... REFERENCES constraint is not yet supported.
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