EXISTS in INSERT Query

Question

Hi,
I want to insert a record in a table if that value does not exists.
Like
select ip_address into ipadd from server_data where ip_address='100.100.100.100';
if ipaddress <> '' then
insert into server_data values(.......);
end if
How to write a query in a single line? Is there any way to check using exists and then insert the value?
Can anyone guide me?
-haifriends

Answer 1

Hi,
A simple example :-
CREATE TABLE SERVER_DATA ( IP_ADDRESS VARCHAR2(1000) );
INSERT INTO SERVER_DATA VALUES('127.0.0.1');
INSERT INTO SERVER_DATA VALUES('127.0.0.2');
INSERT INTO SERVER_DATA VALUES('127.0.0.3');
INSERT INTO SERVER_DATA VALUES('127.0.0.4');
INSERT INTO SERVER_DATA VALUES('127.0.0.5');
INSERT INTO SERVER_DATA VALUES('');
INSERT INTO SERVER_DATA VALUES('');
INSERT INTO SERVER_DATA VALUES('');
COMMIT;
SELECT COUNT(*) FROM SERVER_DATA;
8   
CREATE TABLE SERVER_DATA_MIRROR( IP_ADDRESS VARCHAR2(1000) );
INSERT INTO
     SERVER_DATA_MIRROR
     SELECT * FROM
     SERVER_DATA
     WHERE EXISTS
               SELECT IP_ADDRESS FROM SERVER_DATA
               WHERE IP_ADDRESS IS NOT NULL
COMMIT;
SELECT COUNT(*) FROM SERVER_DATA_MIRROR;
8    Regards,
Sandeep