>I realize your example may not reflect the specific needs of your
>application, ...
Yea, my actual application required a query too complex to be
put in an ordinary "where" clause. I think I've figured it
out - think of the "exists" clause as sort of an implied
join with the table to be partially deleted.
if the selection query is similar to:
select * from image left join attribute on image.uid=attribute.value
I suppose if SQL had anything like a consistent syntax, I would
expect to write this as something like:
delete from image left join attribute on image.uid=attribute.value
SQL doesn't allow this, but this "exists" clause is what you can use instead.
delete from image where exists
(select * from attribute on attribute.value = image.uid)
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