Patty-
That query should run slower than your original. How many rows are you exporting? How big is the wo_master table?
I assume you have an index on person_id. It might run faster with an index on modify_timestamp.
John Viescas, Author
Effective SQL
SQL Queries for Mere Mortals
Microsoft Access 2010 Inside Out
Microsoft Access 2007 Inside Out
Microsoft Access 2003 Inside Out
Building Microsoft Access Applications
(Paris, France)
On Jun 28, 2016, at 9:22 PM, pattykf@cox.net [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:
thank you John,
I gave it a shot, it appeared to run through the query (bar moved on the bottom) but then the sql screen went blank and the mouse hover is just spinning. It appears stuck?
thankx
Patty
---In MS_Access_Professionals@yahoogroups.com, <JohnV@...> wrote :
Patty-
I have a query which will not export to excel. I have been able to export the one that was created that pulled in all the patients but this one that limits the patients to the last encounter will not export. IDEAS?
SELECT wo_master_IM3_elig_Enc.*
FROM wo_master_IM3_elig_Enc INNER JOIN (SELECT person_id, MAX(modify_timestamp) AS TimeMatch FROM wo_master_IM3_elig_Enc GROUP BY person_id) AS MaxRecord ON (wo_master_IM3_elig_Enc.modify_timestamp = MaxRecord.TimeMatch) AND (wo_master_IM3_elig_Enc.person_id = MaxRecord.person_id);
Try this:
SELECT W1.*
FROM wo_master_IM3_Elig_enc AS W1
WHERE modify_timestamp =
(SELECT MAX(modify_timestamp) FROM wo_master_IM3_elig_Enc AS W2
WHERE W2.person_id = W1.person_id);
John Viescas, Author
Effective SQL
SQL Queries for Mere Mortals
Microsoft Access 2010 Inside Out
Microsoft Access 2007 Inside Out
Microsoft Access 2003 Inside Out
Building Microsoft Access Applications
(Paris, France)
On Jun 28, 2016, at 8:26 PM, pattykf@... [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:
I have a query which will not export to excel. I have been able to export the one that was created that pulled in all the patients but this one that limits the patients to the last encounter will not export. IDEAS?
SELECT wo_master_IM3_elig_Enc.*
FROM wo_master_IM3_elig_Enc INNER JOIN (SELECT person_id, MAX(modify_timestamp) AS TimeMatch FROM wo_master_IM3_elig_Enc GROUP BY person_id) AS MaxRecord ON (wo_master_IM3_elig_Enc.modify_timestamp = MaxRecord.TimeMatch) AND (wo_master_IM3_elig_Enc.person_id = MaxRecord.person_id);
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Posted by: John Viescas <johnv@msn.com>
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