If I open an A97 table, resort its key-field to descending order and
attempt to close the table, A97 asks me if I wish to save the table
DESIGN? Now really, I don't think the table design is being saved
at all. If so, how does one explain these facts:
1) say I do click Yes to save the table design
2) later I open the table manually and, sure enough, key field is
shown in descending order
3) I run this in debug window... ?DLookup("[KeyField]", "MyTable")
Step 3 returns the value of the FIRST actual record ever entered
into the table - not the last. Obviously, if fundamental table DESIGN
had been saved as implied by the A97 prompt, the last would-a-been
shown. So, A97 is NOT saving a modified version of table design, is
it? Its merely saving a query filter sort. Sound about right? 6 1703
Only the table's OrderBy property is being saved.
By definition, records are unordered in a relational database. The fact that
Access presents them in primary key order by default is understandable, but
it is outside of what a relational database should do.
A major weakness with DLookup() is that you cannot specify a sort order,
i.e. you take pot luck as to which record is returned if there are multiple
matches. For an extended replacement of DLookup() that solves that problem
by letting you specify the retrieval order, see: http://allenbrowne.com/ser-42.html
--
Allen Browne - Microsoft MVP. Perth, Western Australia.
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
"MLH" <CR**@NorthStat e.net> wrote in message
news:2l******** *************** *********@4ax.c om... If I open an A97 table, resort its key-field to descending order and attempt to close the table, A97 asks me if I wish to save the table DESIGN? Now really, I don't think the table design is being saved at all. If so, how does one explain these facts:
1) say I do click Yes to save the table design 2) later I open the table manually and, sure enough, key field is shown in descending order 3) I run this in debug window... ?DLookup("[KeyField]", "MyTable")
Step 3 returns the value of the FIRST actual record ever entered into the table - not the last. Obviously, if fundamental table DESIGN had been saved as implied by the A97 prompt, the last would-a-been shown. So, A97 is NOT saving a modified version of table design, is it? Its merely saving a query filter sort. Sound about right?
"Allen Browne" <Al*********@Se eSig.Invalid> wrote in
news:42******** *************** @per-qv1-newsreader-01.iinet.net.au : A major weakness with DLookup() is that you cannot specify a sort order, i.e. you take pot luck as to which record is returned if there are multiple matches. For an extended replacement of DLookup() that solves that problem by letting you specify the retrieval order, see: http://allenbrowne.com/ser-42.html
Pardon me, but isn't that a mis-use of DLookup(), to request
criteria that return more than one value? Isn't that really more
like a DFirst() function?
--
David W. Fenton http://www.bway.net/~dfenton
dfenton at bway dot net http://www.bway.net/~dfassoc
David, I'm sure you know that DLookup() will work where the return value is
non-unique, so I understand you to mean that it's not a sensible thing to do
since the return value is undefined/unreliable. Fair enough (though there
are certainly cases where it does make sense, e.g. get me an invoice for
client 54--I don't care which one.)
DFirst() doesn't solve the problem I'm addressing.
None of the domain aggregate functions can answer this:
What is the most recent InvoiceID for Client 54?
where "most recent" is defined by the InvoiceDate.
If we had an extra optional argument for DLookup() to specify the sort
order, you could do that easily:
DLookup("Invoic eID", "tblInvoice ", "ClientID=5 4", "InvoiceDat e DESC")
I actully requsted MS to add this feature, arguning that an optional extra
argument breaks no existing code, and would very useful. It didn't happen,
so I wrote a replacement function that does it.
Actually, that looks incredibly obvious to me, as the arguments match your
basic SQL statement:
SELECT Arg1 FROM Arg2 [WHERE Arg3] [ORDER BY Arg4]
--
Allen Browne - Microsoft MVP. Perth, Western Australia.
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
"David W. Fenton" <dX********@bwa y.net.invalid> wrote in message
news:Xn******** *************** **********@216. 196.97.142... "Allen Browne" <Al*********@Se eSig.Invalid> wrote in news:42******** *************** @per-qv1-newsreader-01.iinet.net.au :
A major weakness with DLookup() is that you cannot specify a sort order, i.e. you take pot luck as to which record is returned if there are multiple matches. For an extended replacement of DLookup() that solves that problem by letting you specify the retrieval order, see: http://allenbrowne.com/ser-42.html
Pardon me, but isn't that a mis-use of DLookup(), to request criteria that return more than one value? Isn't that really more like a DFirst() function?
Allen Browne wrote: Actually, that looks incredibly obvious to me, as the arguments match your basic SQL statement: SELECT Arg1 FROM Arg2 [WHERE Arg3] [ORDER BY Arg4]
my tLookup can do the same, e.g.
tLookup("field" ,"table","field 2='whatever' order by field3 desc")
;-)
And yours has been around longer, Trevor.
BTW, you don't provide the link to your site in your sig?
Maybe that's what "Windows is searching" was all about. :-)
--
Allen Browne - Microsoft MVP. Perth, Western Australia.
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
"Trevor Best" <no****@nospam. invalid> wrote in message
news:42******** *************** @news.zen.co.uk ... Allen Browne wrote: Actually, that looks incredibly obvious to me, as the arguments match your basic SQL statement: SELECT Arg1 FROM Arg2 [WHERE Arg3] [ORDER BY Arg4]
my tLookup can do the same, e.g.
tLookup("field" ,"table","field 2='whatever' order by field3 desc")
;-)
Allen Browne wrote: And yours has been around longer, Trevor.
BTW, you don't provide the link to your site in your sig? Maybe that's what "Windows is searching" was all about. :-)
What sig? <g>
My trusty old Soundblaster went pop and took Windows out with it so no
sig at all ATM until I get around to setting one up again.
I used to have a link about 7 years ago, about the time I last updated
the site :-) This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Michael Lauzon |
last post by:
This is not for a class, I have a group on SourceForge, this is what
one of the Developers is asking; the more advanced you can make it
right off all the better!:
Can someone please create some MySQL to create the first table: the
players table.
It will need to include (as a minimum):
- ID (unique)
|
by: Neal |
last post by:
Patrick Griffiths weighs in on the CSS vs table layout debate in his blog
entry "Tables my ass" - http://www.htmldog.com/ptg/archives/000049.php . A
quite good article.
|
by: 2trax |
last post by:
Hi all,
I am trying to mimic the unix security model (users and groups) in a web
app.
I have thought of two ways of implementing this, but am unsure which would
be better. The first design utilises three tables, while the second
utilises two tables, however one of the columns in the first table is an
an array.
|
by: kimi |
last post by:
I have just started working on a project that is partially complete. It
is an application that is using access to store test results. The test
results are being stored in two Access 2000 databases.
DB #1 = StudentDB
DB #2 = TestResulstsDB
Why are there 2 dbs? I do not know - but that is one of the tings that
we will be changing. Combining all of the data into one database.
|
by: Nathan Sokalski |
last post by:
When editing an ASP Table, Visual Studio does not allow me to edit it in
Design View. This makes it harder to add elements, because I must add every
element either by using Design View to create the element outside of the
table and then using cut & paste in HTML View to move it to the desired
location, or by manually typing the code in using HTML View. The first
technique sometimes does not automatically update the list of elements...
| |
by: david |
last post by:
I have asked this question before. But it does not work for me. Given radion
buttons in the web form design page. What I did is described as follows.
A panel control is dragged into the design form, and a table control is
dragged into the panel from tooolbox. Add cells for the table through the
properties. Now I cut a radio button, and click the table (note I can not
select a cell), then right click Paste. The button is not in expected...
|
by: phil-news-nospam |
last post by:
Is there really any advantage to using DIV elements with float style
properies, vs. the old method of TABLE and TR and TD?
I'm finding that by using DIV, it still involves the same number of
elements in the HTML to get everything just right. When you consider
the class attribute on the DIV elements, there's not much size savings
anymore for using DIV.
There are other disadvantages to not using TABLE/TR/TD, such as the
lack of ability...
|
by: yanjie.ma |
last post by:
Hi,
I've got a two part question on table and form design (sorry for the
length but it takes a bit to explain). Our sales department uses a
look-up table to help the them select the best equipment to use for a
customer's needs. It basically consists of a table with the following
setup:
Equipment: Option1: Option2: Option3: Option 4: ...
-------- ------- ------- -------- --------
|
by: csolomon |
last post by:
Hello:
I was wondering if I could get some input on how to address a design
issue, involving my composite table.
I have one portion of my project complete. The following forms and
reports I will add, piggyback off of my existing design.
The part I have already completed allows my users to create a design
sample; this is made up of several materials to create one sample. I
have accomplished this using this design:
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| |
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
| |
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |