However, that doesn't cover the case where you want to update the record
if it already exists.
Jon
> insert into test (a, b, c, d)
> (select 1, 2, 3, 4 where not exists
> (select 1 from test where a=1 and b=2 and c=3 and d=4)
> );
>
> If your table contains a=1, b=2, c=3, and d=4, nothing will happen, and
> there will be no failed transaction. If your table does not contain a=1,
> b=2, c=3, and d=4, you'll get an insert of a row containing 1, 2, 3, 4.
>
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