0009《SQL必知必會》筆記05-表的創建與約束，《sql必知必會》05-

0009《SQL必知必會》筆記05-表的創建與約束，《sql必知必會》05-

1、創建表：用CREATE TABLE 語句，要指明：表名（不能與現有表名重復）、列名、每列的數據類型

CREATE TABLE product
(
    prod_id            char(10),
    vend_id            char(10),
    prod_name          char(254),
    prod_price         number(8,2),
    prod_desc          varchar(1000)  
);

CREATE TABLE product ( prod_id char(10) NOT NULL PRIMARY KEY, vend_id char(10) NOT NULL, prod_name char(254) NOT NULL, prod_price number(8,2) NOT NULL CHECK(prod_price>0), prod_desc varchar(1000) NOT NULL, CONSTRAINT for_vend_id FOREIGN KEY(vend_id) REFERENCES vendors(vend_id) );

或者：

CREATE TABLE product
(    prod_id        char(10)       NOT NULL,
     vend_id        char(10)       NOT NULL,
     prod_name      char(254)      NOT NULL,
     prod_price     number(8,2)    NOT NULL,
     prod_desc      varchar(1000)  NOT NULL,
PRIMARY KEY(prod_id),
CHECK(prod_price>0),
CONSTRAINT for_vend_id FOREIGN KEY(vend_id) REFERENCES vendors(vend_id)
);