https://www.codebydesign.com/SystemArchitect/Documentation/
容易卡住，然后死機器，還需要探索
初步成果，嘗試了兩張表，主鍵引用，生成的PG,SQL如下
-- +---------------------------------------------------------
-- | MODEL : acctloan
-- | AUTHOR : ccy
-- | GENERATED BY: Open System Architect
-- +---------------------------------------------------------
-- | WARNING : Review before execution
-- +---------------------------------------------------------
-- +---------------------------------------------------------
-- | CREATE
-- +---------------------------------------------------------
CREATE TABLE business_contract
(
serialno ,
customername ,
PRIMARY KEY (serialno)
);
CREATE TABLE acct_loan
(
serialno ,
contractserialno ,
PRIMARY KEY (serialno)
);
CREATE TABLE
(
) INHERITS ();
;
ALTER TABLE acct_loan ADD CONSTRAINT FK_BC_SERIALNO
FOREIGN KEY ( contractserialno )
REFERENCES business_contract ( serialno )
NOT DEFERRABLE;