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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.)...
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by: wireless |
last post by:
I've written code that dynamically builds an sql query based on
various constraint possibilities.
The problem is the code would have been very complex had I not come up
with a dummy constraint...
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by: adammitchell |
last post by:
How can you indicate that a FOREIGN KEY constraint references two
columns in two different tables?
"SQL Server Books Online" show an example of how to reference two
columns in the SAME table:...
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by: ferg |
last post by:
I have a Customer table. The table has two different CHECK constraints.
Then there is the Customer details dialog, which provides the user with
an UI for changing users. I have some UPDATE sql,...
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by: Jeff Kish |
last post by:
Hi.
I'm getting errors like this when I try to run an upgrade script I'm trying to
write/test:
altering labels to length 60
Server: Msg 5074, Level 16, State 4, Line 5
The object...
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by: Laurence |
last post by:
Hi there,
How to differentiate between unique constraint and unique index? These
are very similar but I cannot differentiate them?
Could someone give me a hand?
Thanks in advance
|
by: antpal |
last post by:
I am not sure exactly what i am doing run but when I run this code in sql plus i get constraint error on most of my tables except author and books table. Please help I am new to Programming in...
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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...
|
by: Frank Swarbrick |
last post by:
I have the following three tables
DROP TABLE CALLTRAK.SERVICE_CODES
@
CREATE TABLE CALLTRAK.SERVICE_CODES (
CODE CHAR(1) NOT NULL
, CONSTRAINT SERVICE_CODES_PK
PRIMARY KEY (CODE)
,...
|
by: rorajoey |
last post by:
Violation of UNIQUE KEY constraint 'IX_surveyQuestions'. Cannot insert duplicate key in object 'dbo.surveyQuestions'.
This might seem like a simple matter of trying to insert a row with ID=20 when...
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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,...
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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,...
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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...
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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...
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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...
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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,...
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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: 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 ...
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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...
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