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hich of the following is a valid SQL statements? 1.   CREATE TABLE table1 (Col1 NUMBER PRIMARY KEY, Col2 VARCHAR2(20) PRIMARY KEY, Col3 DATE DEFAULT SYSDATE, Col4 VARCHAR2(2) );   2.   CREATE TABLE table1 (col1 NUMBER, Col2 VARCHAR2(20), Col3 DATE DEFAULT SYSDATE, Col4 VARCHAR2(2));   3.   CREATE TABLE table1 (Col1 NUMBER PRIMARY KEY, Col2 VARCHAR2(20), Col3 DATE, Col4 VARCHAR2(2) NOT NULL, CONSTRAINT table_col3_ck CHECK (col3 = SYSDATE));   4.   CREATE TABLE table1 (col1 NUMBER, Col2 VARCHAR2(20), Col3 DATE, Col4 VARCHAR2(2), PRIMARY KEY (REFERENCES(col1)));

hich of the following is a valid SQL statements? 1.   CREATE TABLE table1 (Col1 NUMBER PRIMARY KEY, Col2 VARCHAR2(20) PRIMARY KEY, Col3 DATE DEFAULT SYSDATE, Col4 VARCHAR2(2) );   2.   CREATE TABLE table1 (col1 NUMBER, Col2 VARCHAR2(20), Col3 DATE DEFAULT SYSDATE, Col4 VARCHAR2(2));   3.   CREATE TABLE table1 (Col1 NUMBER PRIMARY KEY, Col2 VARCHAR2(20), Col3 DATE, Col4 VARCHAR2(2) NOT NULL, CONSTRAINT table_col3_ck CHECK (col3 = SYSDATE));   4.   CREATE TABLE table1 (col1 NUMBER, Col2 VARCHAR2(20), Col3 DATE, Col4 VARCHAR2(2), PRIMARY KEY (REFERENCES(col1)));

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question

Which of the following is a valid SQL statements?

1.

 

CREATE TABLE table1

(Col1 NUMBER PRIMARY KEY,

Col2 VARCHAR2(20) PRIMARY KEY,

Col3 DATE DEFAULT SYSDATE,

Col4 VARCHAR2(2) );

 

2.

 

CREATE TABLE table1

(col1 NUMBER,

Col2 VARCHAR2(20),

Col3 DATE DEFAULT SYSDATE,

Col4 VARCHAR2(2));

 

3.

 

CREATE TABLE table1

(Col1 NUMBER PRIMARY KEY,

Col2 VARCHAR2(20),

Col3 DATE,

Col4 VARCHAR2(2) NOT NULL, CONSTRAINT table_col3_ck CHECK (col3 = SYSDATE));

 

4.

 

CREATE TABLE table1

(col1 NUMBER,

Col2 VARCHAR2(20),

Col3 DATE,

Col4 VARCHAR2(2),

PRIMARY KEY (REFERENCES(col1))); 

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