创建表

CREATE TABLE products_a (prod_id CHAR(10) NOT NULL, vend_id CHAR(10) NOT NULL, prod_name char(254) NOT NULL, prod_price DECIMAL(8,2) NOT NULL, prod_desc VARCHAR(1000) NULL);

使用null值

CREATE TABLE orders_o (order_num INTEGER NOT NULL, order_date datetime NOT NULL, cust_id CHAR(10));

指定默认值

CREATE TABLE orderitems_o (order_num INTEGER NOT NULL, order_item INTEGER NOT NULL, prod_id CHAR(10) NOT NULL, quantity INTEGER NOT NULL DEFAULT 1, item_price DECIMAL(8,2) NOT NULL);
SELECT * FROM orderitems_o;

更新表

ALTER TABLE vendors ADD vend_phone CHAR(20);

删除表

DROP TABLE custcopy;