MySQL建立和操縱表
阿新 • • 發佈:2021-01-10
建立表
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));
指定預設值
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);
刪除表
DROP TABLE custcopy;