CREATE TABLE PROVIDERS
(PROVIDERID INT NOT NULL,
PROVIDERNAME NVARCHAR(50) NOT NULL PRIMARY KEY,  # 設(shè)置的主鍵
PROVIDERCOMNAME NVARCHAR(20),
PROVIDERCOMTITLE NVARCHAR(10),
PROVIDERADD NVARCHAR(50),
PROVIDERACITY NVARCHAR(20),
PROVIDERREGION NVARCHAR(20),
PROVIDERZIP NVARCHAR(10),
PROVIDERCOUNTRY NVARCHAR(10),
PROVIDERTEL NVARCHAR(20),
PROVIDERFAX NVARCHAR(20),
PROVIDERWEB NVARCHAR(50)
--CONSTRAINT PK_PROVNAME PRIMARY KEY(PROVIDENAME)
)

-- 查看真正的主鍵名稱(chēng)
EXEC SP_HELP PROVIDERS