SQL access query- Update row if exists, insert if does not

Question

I need to write an SQL query for MS Access 2000 so that a row is updated if it exists, but inserted if it does not.

i.e.

If row exists...

UPD         


        

Answer 1

Not in one query but you could do two queries for multiple rows.

In MySQL, the equivalent is (as you already know :)

INSERT INTO Table1 (...)
    VALUES(...)
ON DUPLICATE KEY 
    UPDATE column=column+1
;

or

INSERT INTO Table1 (...)
    ( SELECT ...
        FROM ...
    )
ON DUPLICATE KEY 
    UPDATE column=column+1
;

The second form can be written with two queries as:

UPDATE Table1 
    SET (...) 
    WHERE Column1 = 'SomeValue'
;

INSERT INTO Table1 (...)
    ( SELECT ...
        FROM ...
        WHERE 'SomeValue' NOT IN ( SELECT Column1
                                       FROM Table1 )
    )
;

You could also reverse the order and first insert the new rows and then update all rows if that fits with your data better.

*Note that the IN and NOT IN subqueries could be possibly converted to equivalent JOIN and LEFT JOIN with check for NOT NULL forms.