Insert All with Sequence.nextVal Generates Unique Constraint violation [duplicate] - sql

Question

This question already has answers here:
Inserting multiple rows with sequence in Oracle
(5 answers)
Closed 4 years ago.
Why does this query throw an error:
Error report -
ORA-00001: unique constraint (ON24MASTER.LANGUAGE_CODE_PK) violated
Query
INSERT ALL
INTO LANGUAGE_CODE(language_code_id,label,language_cd,country_cd,is_elite)
VALUES(SEQ_LANGUAGE_CODE_ID.NEXTVAL,'Abkhazian','ab',NULL,'N')
INTO LANGUAGE_CODE(language_code_id,label,language_cd,country_cd,is_elite)
VALUES(SEQ_LANGUAGE_CODE_ID.NEXTVAL,'Afar','aa',NULL,'N')
INTO LANGUAGE_CODE(language_code_id,label,language_cd,country_cd,is_elite)
VALUES(SEQ_LANGUAGE_CODE_ID.NEXTVAL,'Afrikaans','af',NULL,'N')
INTO LANGUAGE_CODE(language_code_id,label,language_cd,country_cd,is_elite)
VALUES(SEQ_LANGUAGE_CODE_ID.NEXTVAL,'Akan','ak',NULL,'N')
SELECT 1 FROM DUAL;
Considering select seq_language_code_id.nextval from dual; = 198 and the latest id in db is 180;
What is wrong ? can I not use insert all with .nextVal ?

Answer 1

Nope, you can't do it with INSERT ALL. Have a look at what's going on:
SQL> create sequence seqa;
Sequence created.
SQL> create table test (id number);
Table created.
SQL> insert all
2 into test values (seqa.nextval)
3 into test values (seqa.nextval)
4 into test values (seqa.nextval)
5 into test values (seqa.nextval)
6 select * from dual;
4 rows created.
SQL> select * From test;
ID
----------
1
1
1
1
SQL>
See? All NEXTVALs are just the same, which - in your case - leads to a primary key violation, which means that you'll have to run separate INSERT INTO statements:
SQL> insert into test values (seqa.nextval);
1 row created.
SQL> insert into test values (seqa.nextval);
1 row created.
SQL> insert into test values (seqa.nextval);
1 row created.
SQL> select * From test;
ID
----------
1
1
1
1
2
3
4
7 rows selected.
SQL>