數據庫---主從表操作

如何建立一個主從表，當主表刪除的時候，從表的記錄一期刪除

CREATE TABLE STORES (
  STORE_ID NUMBER(10) NOT NULL,
  SUPPLIER_NAME VARCHAR2(40) NOT NULL,
  CONSTRAINT STORES_PK PRIMARY KEY (STORE_ID));

CREATE TABLE PRODUCTS (
  PRODUCT_ID NUMBER(10) NOT NULL,
  PRODUCT_NAME VARCHAR2(30) NOT NULL,
  SUPPLIER_ID NUMBER(10) NOT NULL,
  STORE_ID NUMBER(10) NOT NULL,
  CONSTRAINT FK_STORES FOREIGN KEY (STORE_ID) REFERENCES STORES(STORE_ID) ON DELETE CASCADE); 

刪除stores的記錄,products也刪除.

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-- 創建測試主表. ID 是主鍵.
CREATE TABLE test_main (
id      INT,
value   VARCHAR(10),
PRIMARY KEY(id) 
);
-- 創建測試子表. 
CREATE TABLE test_sub (
id      INT,
main_id INT,
value   VARCHAR(10),
PRIMARY KEY(id) 
);
-- 創建外鍵(使用 ON DELETE CASCADE 選項，刪除主表的時候，同時刪除子表)
ALTER TABLE test_sub
  ADD CONSTRAINT main_id_cons
    FOREIGN KEY (main_id) REFERENCES test_main ON DELETE CASCADE;

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