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by: Marcus |
last post by:
Hello, quick question about MySQL storing NULL values...
Say I have a textbox called $_POST and a variable $var.
if(empty($_POST))
$var = NULL;
else
$var = $_POST;
Disregarding filtering/formatting the data, upon inserting $var into
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by: Agoston Bejo |
last post by:
I want to enforce such a constraint on a column that would ensure that the
values be all unique, but this wouldn't apply to NULL values. (I.e. there
may be more than one NULL value in the column.)
How can I achieve this?
I suppose I would get the most-hated "table/view is changing,
trigger/function may not see it" error if I tried to write a trigger that
checks the uniqueness of non-null values upon insert/update.
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by: manning_news |
last post by:
Using SQL2000. According to Books Online, the avg aggregrate function
ignores null values. ((3+3+3+3+Null)/5) predictably returns Null. Is
there a function to ignore the Null entry, adjust the divisor, and
return a value of 3? For example:((3+3+3+3)/4) after ignoring Null
entry.
If there's more than one null value, then adjust divisor accordingly.
For example: ((5+5+5+4+Null+5+5+Null)/8) would be ((5+5+5+4+5+5)/6)
after nulls...
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by: JOEP |
last post by:
What do I need to do to allow an append query to post null values to
records in a field of the destination table? Basically I want to allow
records with null values to post to the table. The append query will
not work unless there are values in the data i am attempting to send.
I want the fields in the destination table to accept null and
populated values. Any help here would be gladly accepted.
thanks
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by: John Smith |
last post by:
Hey folks,
How can I get the DateTimePicker not to default to todays date when you
don't specify a value (or if you specify an "" or null as its value)?
It represents a field in my database which legitimately can be null.
Thanks!
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by: Rico |
last post by:
Hello,
I have a foreign key constraint between two tables (Appointments and
MissedAppointmentReasons) and I'd like to allow null values in Appointments
table for the field containing the MissedAppointmentReason, but currently, I
get a Foreign Key Constraint Error when I try to add a record to the
Appointments table.
Any ideas how I can have the null values but still maintain the Foreign Key
Constraint?
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by: gp |
last post by:
I am and have been using PDO for about a year now...and have finally
gotten around to solving the "DB NULL value" issues I ran into early
on...
I am looking for suggestions and techniques to deal with inserting DB
NULL values into my MySQL 5.x DB Tables....I am running PHP 5.2.x on BSD
6.x with Apache 2.2.x....
As mentioned I am writing all my web apps using the PDO extension to
connect and operate on the database. I realized early...
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by: Toby Gallier |
last post by:
Hello!
I have a form that is calculating averages as follows:
" =(NZ()+Nz()+Nz())/3 "
However I need to now adjust for null values , so for example if
value2 is null I would then need to base my average on just 2 values
instead of 3 i am currently using in my string. How can i have the
form update the "3" based on the number of values that are populated?
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by: =?Utf-8?B?R3JlZw==?= |
last post by:
I have the following three files.
1. Users.aspx is a webpage that uses the <asp:ObjectDataSourcecontrol to
populate a simple <asp:ListBoxcontrol.
2. The UserDetails.cs file creates a Namespace named UserComponents and
creates an object named UserDetails.
3. The UserDB.cs file retrieves the actual data from the database.
The code below has been condensed and only includes two fields from my
datasource. I actually am also
retrieving...
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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,...
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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...
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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,...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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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...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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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...
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