Question

MS ACCESS SQL

DELETE * 
FROM Lane_Details
WHERE Lane_Details.Week not in(SELECT DISTINCT TOP 3 Lane_Details.Week
           FROM Lane_Details
WHERE Lane_Details.Week IS NOT NULL
ORDER BY Week DESC; )

DESIRED OUTCOME

What I need this to do is delete anything out of the table that is 4 weeks old or older.

I have been having trouble with the not in. it cause Access to completely lock up. I am not sure what the correct syntax should be for this, and I know that I can write it with a left outer join but I don’t know how to do that.

DATA

ID            Lane  Time                        Week
6213214 83198524    4/6/2012 12:31:00 AM    201315
6213183 61780698    4/6/2012 12:31:00 AM    201311
6213201 11145552    4/6/2012 12:31:00 AM    201315
6213202 82391025    4/6/2012 12:31:00 AM    201314
6213203 11149012    4/6/2012 12:31:00 AM    201311
6213204 11140048    4/6/2012 12:31:00 AM    201311
6213205 83198524    4/6/2012 12:31:00 AM    201316
6213207 61625652    4/6/2012 12:31:00 AM    201316
6213210 61625652    4/6/2012 12:31:00 AM    201311
6637195 36166433    5/1/2012 8:25:00 AM           201314
6637206 77222091    5/1/2012 10:50:00 AM    201314

With this data, I would want to delete any row that has Week 201311. I want to keep 201314, 201315, and 201316.

The subquery will run on this table, and grab the top 3 dates (14, 15, 16) in this case. I then say “not in” to delete all the 11’s.

Answer 1

Thanks for all of the help. I finally realized that it wasn’t my query, it just ran really slow. I think it was a performance issue. I decided to break the query down into a few different ones. It is working much better now. i eventually found this website and came to that conclusion.

VBA isnt the best place to do sub queries.