CREATE TABLE dept (dept_id NUMBER PRIMARY KEY, dept_name VARCHAR2(50) );
CREATE TABLE emp (emp_id NUMBER PRIMARY KEY, emp_name VARCHAR2(50), dept_id NUMBER,
CONSTRAINT emp_fk FOREIGN KEY (dept_id)
REFERENCES dept (dept_id) );
CREATE SEQUENCE myseq1 NOCACHE;
Now examine this statement:
INSERT ALL INTO emp (emp_id, emp_name)
VALUES (myseq1.nextVal, ‘name1’) — name1 insertion
INTO dept (dept_id, dept_name)
VALUES (10, ‘dept1’) — dept1 insertion
INTO emp (emp_id, emp_name, dept_id)
VALUES (myseq1.nextVal, ‘name2’, 10) — name2 insertion
SELECT * FROM dual;
Question: when ran above, giving me error msg and unique constraint violated, can someone please explain me where and how unique key is violated?
Thanks in advance!
I tried reading oracle support document, tried running query in Oracle SQl developer.
Now I’m not getting the reason behind that error.
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