Oracle insert if not exists statement

insert into OPT (email, campaign_id) values('[email protected]',100)
where not exists( select * from OPT where (email ="[email protected]" and campaign_id =100)) ;

> Error report: SQL Error: ORA-00933: SQL command not properly ended > 00933. 00000 - "SQL command not properly ended" > *Cause:
> *Action:

how to insert a new row if it doesn't exists in Oracle?

insert into OPT (email, campaign_id) 
select '[email protected]',100
from dual
where not exists(select * 
                 from OPT 
                 where (email ='[email protected]' and campaign_id =100));

The correct way to insert something (in Oracle) based on another record already existing is by using the MERGE statement.

Please note that this question has already been answered here on SO:

• https://stackoverflow.com/questions/3147874/oracle-insert-if-row-not-exists
• https://stackoverflow.com/questions/1702832/insert-if-not-exists-oracle

MERGE INTO OPT
USING
    (SELECT 1 "one" FROM dual) 
ON
    (OPT.email= '[email protected]' and OPT.campaign_id= 100) 
WHEN NOT matched THEN
INSERT (email, campaign_id)
VALUES ('[email protected]',100) 
;

insert into OPT       (email,        campaign_id) 
select 'mom@coxnet' as email, 100 as campaign_id from dual MINUS
select                 email,        campaign_id from OPT;

If there is already a record with [email protected]/100 in OPT, the MINUS will subtract this record from the select 'mom@coxnet' as email, 100 as campaign_id from dual record and nothing will be inserted. On the other hand, if there is no such record, the MINUS does not subract anything and the values mom@coxnet/100 will be inserted.

As p.marino has already pointed out, merge is probably the better (and more correct) solution for your problem as it is specifically designed to solve your task.

Another approach would be to leverage the INSERT ALL syntax from oracle,

INSERT ALL 
    INTO table1(email, campaign_id) VALUES (email, campaign_id)
WITH source_data AS
 (SELECT '[email protected]' email,100 campaign_id
  FROM   dual
  UNION ALL
  SELECT '[email protected]' email,200 campaign_id
  FROM   dual)      
SELECT email
      ,campaign_id
FROM   source_data src
WHERE  NOT EXISTS (SELECT 1
        FROM   table1 dest
        WHERE  src.email = dest.email
        AND    src.campaign_id = dest.campaign_id);

INSERT ALL also allow us to perform a conditional insert into multiple tables based on a sub query as source.

There are some really clean and nice examples are there to refer.

1. oracletutorial.com
2. oracle-base.com/