by: KULJEET |
last post by:
foreign key also refer to unique constraint.
(GREAT...)
1.then table that containt unique constraint act as master table?????
2.IS unique constraint will replace with primary key??
3.Is unique...
|
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.)...
|
by: Kamil |
last post by:
Hello
What should I use for better perfomance since
unique constraint always use index ?
Thanks
Kamil
|
by: Dave |
last post by:
Can you create a unique constraint on multiple columns, or does it have
to be implemented as a unique index?
If possible can someone please post some sample code?
Thanks,
|
by: Prince Kumar |
last post by:
Is there any way I can define an Unique constraint or unique index
which allows more than one null values for the same column combination
in DB2?
ie, If my index is defined on (col3, col4) where...
|
by: aj |
last post by:
DB2 WSE 8.1 FP5
Red Hat AS 2.1
What is the difference between adding a unique constraint like:
ALTER TABLE <SCHEMA>.<TABLE> ADD CONSTRAINT CC1131378283225 UNIQUE (
<COL1>) ;
and adding a...
|
by: Brian Keating |
last post by:
Hi there,
Is it possible to add a unique constraint on two columns in a table, so that
the constraint is a composite of the two? i.e. these two columns together
should be unique...?
i.e....
|
by: D. Dante Lorenso |
last post by:
I'm trying to build a table that will store a history of records
by enumerating the records. I want the newest record to always
be number ZERO, so I created a trigger on my table to handle the...
|
by: Mike Hunter |
last post by:
(Please CC me on any replies as I'm not on the list)
Hi,
After a recent power failure, a program that uses a pgsql backend
(netdisco) started to send me nastygrams. I tried the author's...
|
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: nemocccc |
last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
|
by: Sonnysonu |
last post by:
This is the data of csv file
1 2 3
1 2 3
1 2 3
1 2 3
2 3
2 3
3
the lengths should be different i have to store the data by column-wise with in the specific length.
suppose the i have to...
|
by: Hystou |
last post by:
There are some requirements for setting up RAID:
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by: marktang |
last post by:
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by: Hystou |
last post by:
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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: 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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