Which CREATE TABLE statement is valid?
A. CREATE TABLE ord_details (ord_no NUMBER(2) PRIMARY KEY, item_no NUMBER(3) PRIMARY KEY, ord_date DATE NOT NULL);
B. CREATE TABLE ord_details (ord_no NUMBER(2) UNIQUE, NOT NULL, item_no NUMBER(3), ord_date DATE DEFAULT SYSDATE NOT NULL);
C. CREATE TABLE ord_details (ord_no NUMBER(2) , item_no NUMBER(3), ord_date DATE DEFAULT NOT NULL, CONSTRAINT ord_uq UNIQUE (ord_no), CONSTRAINT ord_pk PRIMARY KEY (ord_no));
D. CREATE TABLE ord_details (ord_no NUMBER(2), item_no NUMBER(3), ord_date DATE DEFAULT SYSDATE NOT NULL, CONSTRAINT ord_pk PRIMARY KEY (ord_no, item_no));
Answer:D
Which CREATE TABLE statement is valid?
A. CREATE TABLE ord_details (ord_no NUMBER(2) PRIMARY KEY, item_no NUMBER(3) PRIMARY KEY, ord_date DATE NOT NULL); B. CREATE TABLE ord_details (ord_no NUMBER(2) UNIQUE, NOT NULL, item_no NUMBER(3), ord_date DATE DEFAULT SYSDATE NOT NULL); C. CREATE TABLE ord_details (ord_no NUMBER(2) , item_no NUMBER(3), ord_date DATE DEFAULT NOT NULL, CONSTRAINT ord_uq UNIQUE (ord_no), CONSTRAINT ord_pk PRIMARY KEY (ord_no)); D. CREATE TABLE ord_details (ord_no NUMBER(2), item_no NUMBER(3), ord_date DATE DEFAULT SYSDATE NOT NULL, CONSTRAINT ord_pk PRIMARY KEY (ord_no, item_no));