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Comparing fields in tables
I am working with the article that MAK wrote on SecurityLogs http://www.databasejournal.com/featu...le.php/3515886
I have completed this, but I have made some changes to the database (for normalization to 3NF purposes). I now have problems with a query.
I am trying to "Insert a new record in a table if it does not already exist in the table". To try to clarify I perform the following query:
INSERT INTO Tmp_Event
SELECT DISTINCT EventID, EventType, EventTypeName from Tmp
Which gives me the Tmp_Event table consisting of EventID's etc. (no duplicates). What I then want to do, is compare the 'Tmp_event' table and an already existing 'Event' table. These two tables are in fact identical. I would like to insert any records from 'Tmp_Event' into 'Event' if they do not already exist in 'Event'.
This query gives me all records that do not exist in 'Event'
SELECT EventID, EventType, EventTYpeName from Tmp_Event
WHERE EventID NOT IN (SELECT EventID from Event)
How can I change this query into performing an INSERT INTO Event as well?
Hope this makes sense
-Silia
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Simple
INSERT INTO Tmp_Event
SELECT EventID, EventType, EventTYpeName from Tmp_Event
WHERE EventID NOT IN (SELECT EventID from Event)
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Thanks! That of course worked... However it should be
'INSERT INTO Event' but hey, minor details...
Silia
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