Question

所以，这是我的代码。当我尝试在学校提供的引擎中编译它时，我发现了一些错误，并且每次运行时它们都会改变，但我现在拥有的是：

第123行的错误1064（42000）：您的SQL语法出错; 检查与您的MySQL服务器版本对应的手册正确的语法使用在＆＃39; 9：30，＆＃39; L210＆＃39;，103,15），（86,25,2， 6/10/2007 9：30，＆＃39; L210＆＃39;，107,15），（89,25,5＆＃39;在第2行

我已经试图取出空间，但没有区别。这与我获取信息的顺序有什么关系吗？还是别的什么？

我也不确定第一步的表格是否正在下降。

/*Step One: Drop Tables*/
DROP TABLE IF EXISTS Student;
DROP TABLE IF EXISTS Zipcode;
DROP TABLE IF EXISTS Instructor;
DROP TABLE IF EXISTS Enrollment;
DROP TABLE IF EXISTS Sections;
DROP TABLE IF EXISTS Course;


/*Step Two: Create Tables*/
CREATE TABLE Zipcode
(
zip             int(11), 
city            varchar(25)     NOT NULL,  
state           varchar(2)      NOT NULL,
PRIMARY KEY (zip)
);

CREATE TABLE Student
(
student_ID          int(6)          UNIQUE,
salutation          varchar(5), 
first_name          varchar(25)     NOT NULL, 
last_name           varchar(25)     NOT NULL, 
street_address      varchar(50), 
phone               int(15)         NOT NULL, 
employer            varchar(50) , 
registration_date   date            NOT NULL, 
zip                 int(11),
PRIMARY KEY (student_ID),
FOREIGN KEY (zip) REFERENCES Zipcode (zip)
);

CREATE TABLE Course
(
    course_ID           int(6)          UNIQUE,
    description         varchar(50)     NOT NULL,
    cost                dec(8,2)        NOT NULL,
    prerequisite        int(6),
    PRIMARY KEY (course_ID),
    FOREIGN KEY (prerequisite) REFERENCES Course (course_ID)
);

CREATE TABLE Instructor
(
Instructor_ID   int(6)              UNIQUE,
salutation      varchar(5), 
first_name      varchar(25)         NOT NULL, 
last_name       varchar(25)         NOT NULL, 
street_address  varchar(50), 
zip             int(11)             NOT NULL,
PRIMARY KEY (Instructor_ID),
FOREIGN KEY (zip) REFERENCES zipcode (zip)
);

CREATE TABLE Sections
(
section_ID          int(8)          UNIQUE,
course_id           int(6)          NOT NULL,
course_section_num  int(6)          NOT NULL,
start_date_time     datetime        NOT NULL,
location            varchar(10),
instructor_ID       int(6)          NOT NULL,
capacity            int(3),
PRIMARY KEY (section_ID),
FOREIGN KEY (instructor_ID) REFERENCES Instructor (instructor_ID),
FOREIGN KEY (course_ID) REFERENCES Course (course_ID)   
);

CREATE TABLE Enrollment
(
student_ID          int(6)          UNIQUE,
section_ID          int(8)          UNIQUE,
enroll_date         datetime        NOT NULL,
final_grade         char(1),
PRIMARY KEY (section_ID, student_ID),
FOREIGN KEY (section_ID) REFERENCES sections (section_ID),
FOREIGN KEY (student_ID) REFERENCES student (student_ID)
);


/*Step Three: Insert Rows*/
INSERT INTO Zipcode VALUES
(7024, 'Ft. Lee', 'NJ'),
(7047, 'North Bergen', 'NJ'),
(10005, 'New York', 'NY'),
(10015, 'New York', 'NY'),
(10025, 'New York', 'NY'),
(10035, 'New York', 'NY'),
(11419, 'Richmond Hill', 'NY'),
(11435, 'Jamaica', 'NY');

INSERT INTO Student VALUES
(102, 'Mr.', 'Fred', 'Crocitto', '101-09 120th St.', 718-555-5555, 'Albert Hildegard Co.', 1/22/2007, 11419),
(103, 'Ms.', 'J.', 'Landry', '7435 Boulevard East #45', 201-555-5555, 'Albert Hildegard Co.', 1/22/2007, 7047),
(104, 'Ms.', 'Laetia', 'Enison', '144-61 87th Ave', 718-555-5555, 'Albert Hildegard Co.', 1/22/2007, 11435),
(105, 'Mr.', 'Angel', 'Moskowitz', '320 John St.', 201-555-5555, 'Alex. & Alexander', 1/22/2007, 7024),
(163, 'Ms.', 'Nicole', 'Gillen', '4301 N Ocean #103', 904-555-5555, 'Oil of America Corp.', 2/2/2007, 10025),
(223, 'Mr.', 'Frank', 'Pace', '13 Burlington Dr.', 203-555-5555, 'Board Utilities', 2/8/2007, 10025),
(399, 'Mr.', 'Jerry', 'Abdou', '460 15th St. #4', 718-555-5555, 'Health Mgmt.Systems', 2/23/2007, 10025);

INSERT INTO Course VALUES
(330, 'Network Administration', 1195, 130),
(310, 'Operating Systems', 1195, NULL),
(142, 'Project Management', 1195, 20),
(140, 'Systems Analysis', 1195, 20),
(130, 'Intro to Unix', 1195, 310),
(25, 'Intro to Programming', 1195, 140),
(20, 'Intro to Information Systems', 1195, NULL);

INSERT INTO Instructor VALUES
(101, 'Mr.', 'Fernand', 'Hanks', '100 East 87th', 10015),
(102, 'Mr.', 'Tom', 'Wojick', '518 West 120th', 10025),
(103, 'Ms.', 'Nina', 'Schorin', '210 West 101st', 10025),
(104, 'Mr.', 'Gary', 'Pertez', '34 Sixth Ave', 10035),
(105, 'Ms.', 'Anita', 'Morris', '34 Maiden Lane', 10015),
(106, 'Rev.', 'Todd', 'Smythe', '210 West 101st', 10025),
(107, 'Dr.', 'Marilyn', 'Frantzen', '254 Bleeker', 10005);

INSERT INTO Sections VALUES
(81, 20, 2, 7/24/2007 9:30, 'L210', 103, 15),
(86, 25, 2, 6/10/2007 9:30, 'L210', 107, 15),
(89, 25, 5, 5/15/2007 9:30, 'L509', 103, 25),
(92, 25, 8, 6/13/2007 9:30, 'L509', 106, 25),
(104, 330, 1, 7/14/2007 10:30, 'L511', 104, 25),
(119, 142, 1, 7/14/2007 9:30, 'L211', 103, 25),
(155, 122, 4, 5/4/2007 9:30,  'L210', 107, 15);

INSERT INTO Enrollment VALUES
(102, 86, 1/30/2007, NULL, 'B'),
(102, 89, 1/30/2007, 92,'A'),
(103, 81, 1/30/2007, NULL),
(104, 81, 1/30/2007, NULL, 'A'),
(163, 92, 2/10/2007, NULL),
(223, 104, 2/16/2007, NULL,'C'),
(223, 119, 2/16/2007, NULL);


/*Step Four: Select Statements*/
SELECT * FROM Student;
SELECT * FROM Zipcode;
SELECT * FROM Instructor;
SELECT * FROM Course;
SELECT * FROM Sections;
SELECT * FROM Enrollment;

Answer 1

错误消息标识的问题是datetime文字，此处为：

 INSERT INTO Sections VALUES
 (81, 20, 2, 7/24/2007 9:30, 'L210', 103, 15)
             ^^^^^^^^^^^^^^

要获取分配给datetime列的值，您可以执行以下操作：

 (81, 20, 2, '2007-07-24 09:30', 'L210', 103, 15)
             ^^^^^^^^^^^^^^^^^^

日期时间文字应该用单引号括起来，并以'YYYY-MM-DD'或'YYYY-MM-DD HH:MI:SS'等格式表示。

（也可以传入数字十进制值。但没有人真正这样做。只需使用正确格式的字符串文字。我相信新版本的MySQL比早期版本更宽松，关于两个版本的严格性月份的字符和白天的两个字符，并使用除短划线以外的分隔符。我认为也可以省略日期时间的分隔符

我认为MySQL也会接受这样的事情：

   '20070724093000'

但同样，没有人真的这样做。只需将值作为字符串以标准'YYYY-MM-DD HH:MI:SS'格式提供。

SQL代码未运行：可能会丢弃表和组织问题？

1 个答案: