| |
by: Robin Tucker |
last post by:
I'm considering adding domain integrity checks to some of my database table
items. How does adding such constraints affect SQL Server performance? For
example, I have a simple constraint that restricts a couple of columns to
having values within the values assigned in my application by an
enumeration:
(( >= 0 and <=3) and ( >= 0 and <=
2))
This enforces domain integrity for two enumerations having values 0, 1, 2, 3
|
by: serge |
last post by:
I am doing a little research on Google about this topic and I ran into
this thread:
http://groups.google.com/group/microsoft.public.sqlserver.programming/browse_thread/thread/63cce060ff152dcc/1dc13d4ee6758966?lnk=st&q=difference+constraint+sql+defaults&rnum=14#1dc13d4ee6758966
I read SQL Server MVP Louis Davidson's post saying:
"Actually they are more likely to drop the concept of bound defaults.
Constraints are the standard way to do...
|
by: Andreas Fromm |
last post by:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Please consider the following situation.
CREATE TABLE test_table (
~ id SERIAL PRIMARY_KEY,
~ tag BOOLEAN,
~ field1 INTEGER
);
|
by: Chuck Reed |
last post by:
I am working on a sales report where I show weekly sales by category
for each of the 52 weeks in the year. Each record in my table/report
has the 52 weeks of sales in it. I want to highlight to top five weeks
of sales for each category by using a conditonal format to highlight
these top five weeks. I've been trying to find a way to do this but
have not been sucessful looking through many books on Access and in
reading the user groups. If...
|
by: Frnak McKenney |
last post by:
One part of a customer project I'm working on involves what seem
like fairly straightforward updates to a set of related tables.
While I've developed software for a number of years (it only seems
like centuries on days like this <grin>), I'm new to C# and ADO.NET
and I'm running into problems with record deletions.
I (think I am) applying ForeignKeyConstraints correctly. I'm not
applying DataRelations (yet), but those _appear_ to be...
|
| |
by: Emin |
last post by:
Dear Experts,
When I use a single table I can easily use constraints to enforce my
business logic, but what do I do when I normalize a single table into
multiple tables.
For example, imagine that my initial table has the columns ID, Name,
Salary with the constraint that Salary is not NULL. Now imagine that
I break this into two tables, one with ID and Name and another with ID
and Salary. I would like to have a constraint that...
|
by: yeoj13 |
last post by:
Hello,
I have a db2load script I'm using to populate a large table.
Ideally, my target table is required to have "Not Null" constraints on
a number of different columns.
I've noticed a huge performance hit when I load the target table with
"Not Null" constraints as compared to loading a target table without
the constraints.
|
by: Dan Holmes |
last post by:
How do you connect the check constraints on the Table object with the
columns in the table?
I ended up doing this and it smells bad.
foreach (Column cn in t.Columns)
{
foreach (Check ch in t.Checks)
{
if (ch.Text.Contains(cn.Name))
|
by: Kenneth Koenraadt |
last post by:
Hi Wing,
The utility Oracle offers for that is *check constraints*.
For instance :
ALTER TABLE Demerit ADD CONSTRAINT a1 CHECK (points between 1 and 6);
ALTER TABLE Demerit ADD CONSTRAINT a2 CHECK (dem_code <= 20 or
dem_code 20 and points <=3);
|
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: 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...
|
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...
|
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: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
|
| |
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...
|
6
