Oracle SQL语句不起作用

Question

Can someone please tell me exactly what is wrong with this SQL and why it is not executing!

DROP TABLE CAR5849;
CREATE TABLE CAR5849 (
  IDNO      VARCHAR(20) PRIMARY KEY
, MAKE        VARCHAR(20)
, MILES      NUMBER(6)
, DATEOFPURCHASE      DATE
);


INSERT INTO CAR5849 (IDNO, MAKE, MILES, DATEOFPURCHASE) VALUES (PGJ058,'Red Mustang', 27070, TO_DATE(‘11/07/2011’, ‘DD/MM/YYYY’);
INSERT INTO CAR5849 (IDNO, MAKE, MILES, DATEOFPURCHASE) VALUES (PGJ058,'Yellow Mustang', 35725, TO_DATE(‘24/09/2015’, ‘DD/MM/YYYY’);
INSERT INTO CAR5849 (IDNO, MAKE, MILES, DATEOFPURCHASE) VALUES (PGJ058,'Black Mustang', 14589, TO_DATE(‘11/02/2010’, ‘DD/MM/YYYY’);

Answer 1

You are missing single quotes around the first argument. I would recommend three other changes:

• VARCHAR2 instead of VARCHAR
• DATE instead of TO_DATE()
• Remove the primary key from IDNO , because you appear to want to set the column to the same value in multiple rows.

So:

DROP TABLE CAR5849;

CREATE TABLE CAR5849 (
  IDNO      VARCHAR2(20),
  MAKE      VARCHAR2(20),
  MILES      NUMBER(6),
  DATEOFPURCHASE  DATE
);

INSERT INTO CAR5849 (IDNO, MAKE, MILES, DATEOFPURCHASE)
    VALUES ('PGJ058', 'Red Mustang', 27070, DATE '2011-07-11');
INSERT INTO CAR5849 (IDNO, MAKE, MILES, DATEOFPURCHASE)
    VALUES ('PGJ058', 'Yellow Mustang', 35725, DATE '2015-09-24');
INSERT INTO CAR5849 (IDNO, MAKE, MILES, DATEOFPURCHASE)
    VALUES ('PGJ058', 'Black Mustang', 14589, DATE '2010-02-11');

Answer 2

列IDNO被定义为主键，因此您不能为此列添加重复的条目，所有3个插入语句都具有相同的IDNO值，IDNO具有唯一的值或从IDNO中删除主键