Re: [MS_AccessPros] too many databases open export issue

 

the master Im table currently has over 500,000 rows of data and growing.  Modify timestamp could be the same for different patients would that matter in creating an index on modify_timestamp?
thank you
Patty

---In MS_Access_Professionals@yahoogroups.com, <JohnV@...> wrote :

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 

http://www.viescas.com/ 

(Paris, France)

On Jun 28, 2016, at 9:22 PM, pattykf@... [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-

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 

http://www.viescas.com/ 

(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);

thank you

Patty

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Posted by: pattykf@cox.net

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