Question

此SQL语句有什么问题？

Create table JaretsSchedule
(
    ScheduleID Int Primary Key NOT NULL,
    FieldID Int NOT NULL,
    HomeTeamID Int NOT NULL,
    AwayTeamID Int NOT NULL,
    GameTime DateTime NOT NULL
);

Insert into JaretsSchedule
Values 
(1, 1, 1, 2, '2012-10-02 12:00:00'),
(1, 1, 1, 3, '2012-10-17 12:00:00'),
(1, 1, 1, 4, '2012-09-23 12:00:00'),
(1, 2, 2, 1, '2012-09-12 12:00:00'),
(1, 3, 3, 1, '2012-08-19 12:00:00'),
(1, 4, 4, 1, '2012-07-25 12:00:00'),
(2, 2, 2, 1, '2012-09-15 12:00:00'),
(2, 2, 2, 3, '2012-09-06 12:00:00'),
(2, 2, 2, 4, '2012-08-28 12:00:00'),
(2, 1, 1, 2, '2012-10-02 12:00:00'),
(2, 3, 3, 2, '2012-08-11 12:00:00'),
(2, 4, 4, 2, '2012-07-17 12:00:00'),
(3, 3, 3, 1, '2012-08-19 12:00:00'),
(3, 3, 3, 2, '2012-08-11 12:00:00'),
(3, 3, 3, 4, '2012-08-03 12:00:00'),
(3, 1, 1, 3, '2012-10-17 12:00:00'),
(3, 2, 2, 3, '2012-10-17 12:00:00'),
(3, 4, 4, 3, '2012-07-09 12:00:00'),
(4, 4, 4, 1, '2012-07-25 12:00:00'),
(4, 4, 4, 2, '2012-07-17 12:00:00'),
(4, 4, 4, 3, '2012-07-09 12:00:00'),
(4, 1, 1, 4, '2012-09-23 12:00:00'),
(4, 2, 2, 4, '2012-08-28 12:00:00'),
(4, 3, 3, 4, '2012-08-03 12:00:00');

出现错误：

Msg 2627，第14级，状态1，第8行
违反主键约束'PK__JaretsSc__9C8A5B696CFE9A03'。无法在对象'dbo.JaretsSchedule'中插入重复的密钥。重复的键值为（1）。

Answer 1

错误消息从字面上告诉您问题出在哪里。对于定义为主键的ScheduleID列，您不能多次插入相同的值。一旦解决，这里就是将这一列设为身份/自动增量列。然后，在插入时甚至不包含其值。相反，让SQL Server处理它：

CREATE TABLE JaretsSchedule (
    ScheduleID INT NOT NULL IDENTITY PRIMARY KEY,
    FieldID INT NOT NULL,
    HomeTeamID INT NOT NULL,
    AwayTeamID INT NOT NULL,
    GameTime DateTime NOT NULL
);

INSERT INTO JaretsSchedule (FieldID, HomeTeamID, AwayTeamID, GameTime)
VALUES
    (1, 1, 2, '2012-10-02 12:00:00'),
    (1, 1, 3, '2012-10-17 12:00:00'),
    (1, 1, 4, '2012-09-23 12:00:00'),
    ...

还要注意，我按顺序显式列出了作为插入目标的列。这也是最佳做法，并且可以避免以后可能不清楚VALUES子句中的数据对应于哪些列的情况。

此SQL CREATE + INSERT批处理有什么问题？

1 个答案: