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1. capricorn12,136,854
2. DatabaseMX1,791,758
3. LSMCons...1,256,766
4. boag20001,036,189
5. peter57r799,346
6. matthews...688,896
7. rockiroads574,427
8. thenelson445,637
9. GRayL434,146
10. TextReport434,053
11. puppydog...400,608
12. tbsgadi367,274
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20. LPurvis165,663
21. angelIII146,835
22. hnasr137,021
23. kelvinsparks136,703
24. Tramtrak136,379
25. mildurait128,151

1. capricorn113,063,646
2. DatabaseMX6,134,612
3. rockiroads6,047,347
4. nico50385,705,281
5. LSMCons...5,307,939
6. peter57r5,070,812
7. LPurvis3,627,703
8. harfang3,312,263
9. shanesue...3,288,317
10. GRayL3,271,116
11. stevbe2,861,511
12. jimhorn2,807,017
13. boag20002,733,425
14. matthews...2,521,203
15. mbizup2,374,174
16. thenelson2,146,006
17. flavo2,117,383
18. jadedata1,968,277
19. jefftwilley1,887,172
20. puppydog...1,849,966
21. cactus_d...1,681,384
22. eghtebas1,534,843
23. JDettman1,468,976
24. jjafferr1,340,995
25. dannywar...1,329,637

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6.6

Union query is WAY too slow

Asked by Casjas333 in Microsoft Access Database

Tags: slow, union, query

This Union query is WAY too slow. The underlying table only has 188 records and it takes about 2 minutes or more for this to load. Any suggestions on making it faster?

SELECT A.ID, A.Site, A.[Date Monitored], A.[Opt Time Final], A.[TSFR VAL], ((C.[Est VFH Conc1]-B.[Est VFH Conc1])/((C.[Opt Time Final]-B.[Opt Time Final])))*(A.[Opt Time Final]-B.[Opt Time Final])+(B.[Est VFH Conc1]) AS Calc1
FROM [System tbl 0064 VFH qry] AS A, [System tbl 0064 VFH qry] AS B, [System tbl 0064 VFH qry] AS C
WHERE (((A.[Opt Time Final])>=[B].[Opt Time Final] And (A.[Opt Time Final])<=[C].[Opt Time Final]) AND ((A.[Est VFH Conc1])=0) AND ((B.[Opt Time Final])=(Select MAX(X.[Opt Time Final]) FROM [System tbl 0064 VFH qry] AS X WHERE X.[Opt Time Final]<= A.[Opt Time Final] AND X.[Est VFH Conc1]<>0)) AND ((C.[Opt Time Final])=(Select MIN(Y.[Opt Time Final]) FROM [System tbl 0064 VFH qry] AS Y WHERE A.[Opt Time Final] < Y.[Opt Time Final] AND Y.[Est VFH Conc1]<>0)) AND ((C.[Est VFH Conc1])<>0) AND ((([B].[Est VFH Conc1]))<>0)) UNION SELECT Z.[ID], Z.[Site], Z.[Date Monitored], Z.[Opt Time Final], Z.[TSFR Val], 0 As Calc1 FROM [system tbl 0064 VFH qry] AS Z WHERE Z.[Est VFH Conc1] <>0;

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Union query is WAY too slow

Asked by Casjas333 in Microsoft Access Database

Tags: slow, union, query

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