Re: SQL cursor defined two different ways?

I liked Charles' idea of UNION ALL between the two SELECTs. If it is not
possible to get results from one of the SELECTs due to a condition in the
WHERE clause then it should work fine. My only concern might be the
performance impact from doing an unnecessary JOIN on a large table even if
that SELECT isn't going to return any rows. Maybe Visual Explain would give
an idea on that potential impact.


-Paul.

On 30 November 2016 at 21:15, David Gibbs <david@xxxxxxxxxxxx> wrote:

On 11/30/2016 3:09 PM, Paul Nicolay wrote:

Dynamic cursors is one of the solutions... but it opens a lot of
issues (like SQL injection) with parameters .

The only solution to avoid this is to use multiple cursors (which is
also extra coding).

Charles Wilt's idea of using a union all query appears to be working fine
for my purposes.

david



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