key to parent not found

I created two tables describing the main keys and others with foreign key

Here's my parent and child tables
CREATE TABLE STUDENT("FIRST NAME"  VARCHAR2(15) NOT NULL,
                     "LAST NAME"  VARCHAR2(15) NOT NULL,
                     ADDRESS VARCHAR2(35),
                     EMAIL VARCHAR2(20),
                     PHONE NUMBER(11),
                     "FATHER NAME" VARCHAR2(15),
                     "FACULTY ID" NUMBER(4),
                     "STUDENT ADVISER"  NUMBER(4) NOT NULL,
                     "COLLEGE ID" NUMBER(4),
                     RNO NUMBER(4) NOT NULL,
                     YEAR NUMBER(4) NOT NULL,
                     BRANCH VARCHAR2(10),
CONSTRAINT UK_STUDENT UNIQUE(RNO),
CONSTRAINT PK_STUDENT PRIMARY KEY("COLLEGE ID","FACULTY ID")
);

CREATE TABLE TEACHER("FACULTY ID" NUMBER(4),
                     "FIRST NAME" VARCHAR2(15),
                     "COLLEGE ID" NUMBER(4),
                     "LAST NAME" VARCHAR2(15),
                     ADDRESS VARCHAR2(30),
                     QUALIFICATION VARCHAR2(15),
                     EXPERIENCE NUMBER(4),
                     "SUBJECT SPECIALIZATION" VARCHAR2(15),
                     CONSTRAINTS FK_TEACHER FOREIGN KEY("FACULTY ID","COLLEGE ID")
                     REFERENCES STUDENT("FACULTY ID","COLLEGE ID")
);
But when I try to insert into the child table I get the error "key of parent not found.
SQL> INSERT INTO TEACHER VALUES(10,'MALATHI',1,'S','2-4/5,LANGERHOUZ','M.TECH',4,'STUDENT ADVISER');
INSERT INTO TEACHER VALUES(10,'MALATHI',1,'S','2-4/5,LANGERHOUZ','M.TECH',4,'STUDENT ADVISER')
*
ERROR at line 1:
ORA-02291: integrity constraint (SCOTT.FK_TEACHER) violated - parent key not found
can someone explain to me why this happens

>
ERROR on line 1:
ORA-02291: integrity constraint (SCOTT. FK_TEACHER) violated - key parent not found
>

You get this error because the table of the teacher refers to the student table.

have you noticed this?

CONSTRAINTS FK_TEACHER FOREIGN KEY("FACULTY ID","COLLEGE ID")
                     REFERENCES STUDENT("FACULTY ID","COLLEGE ID")

So you cannot insert a record into the teacher table unless there is a record in the student table that has the same faculty_id and college_id

For example, if you insert a record into the table of student with faculty_id = 10 and college_id = 1, then only you can insert a record into the table of teaching with faculty_id = 10 and college_id = 1.

G.

Tags: Database

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    At the start of the black screen appears and tells Diskeyye drive 0 seek failure 1 drive not found: Serial ATA, SATA2 strike F1 key to continue, F2 to run the Setup utility, how can I keep this lift every time?

    Hi FRANKDURHAM,

    1. are you able to boot into Windows after the error message?

    2. did you of recent changes on the computer?

    3 when was the last time it was working fine?

    Usually, this would happen if the hard drive is not set correctly in the basic input/output system (BIOS) or the settings in the basic input/output system (BIOS) are incorrect.

    Basic input/output system (BIOS) is a program built into personal computers that starts the operating system when you turn on your computer. It is also referred to as system firmware. Basic input/output system (BIOS) is part of the hardware of your computer and is separate from Windows.

    Microsoft cannot provide specific instructions for changing your CMOS and BIOS settings because they are specific to your computer. For more information about the correct CMOS and BIOS settings for your computer and how to check and change these settings, see your computer documentation or contact the manufacturer of your computer.

    Important: Change (CMOS) BIOS/complementary metal oxide semiconductor settings can cause serious problems that may prevent your computer from starting properly. Microsoft cannot guarantee that problems resulting from the configuration of the BIOS/CMOS settings can be solved. Changes to settings are at your own risk.

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