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: Laphan |
last post by:
Hi All
I know you can set a row to be unique, but I want expand on this in that I
want the DB schema to only disallow an entry if the row isn't unique across
3 fields. Is it possible?
My DDL...
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by: June Moore |
last post by:
Hi,
I would like to add a unique index that consists of two fields in a
table.
e.g. tbl_A (field1,field2) -- field1 & field2 Indexed and combination
must be Unique.
Can anyone tell me the...
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by: Kamil |
last post by:
Hello
What should I use for better perfomance since
unique constraint always use index ?
Thanks
Kamil
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by: Rolf Kemper |
last post by:
Dear Experts,
I got stuck with the following problem and need your help.
What I wnat to do is to get a set of distinct nodes.
Before the distinct I have selected the multiple occourences...
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by: Bob Stearns |
last post by:
I was under the impression that the primary key had to be a unique
index. Since I usually create my primary indices before my primary keys,
in order to get the indices in the same schema as their...
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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...
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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: vj_dba |
last post by:
Hi Group,
I have a Primary key in my table. It's clear Primary key wont allow
duplicates, this primary key creates one index for retrival. Suppose if
my table is having a Unique index also....
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by: rdsandy |
last post by:
Hi,
I have a table Risk, a table Mitigation and a table RiskArchive. I am taking the RiskID, Criticality and MitigationPlan fields from Risk, and MitigationActionID from Mitigation and inserting...
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by: DolphinDB |
last post by:
Tired of spending countless mintues downsampling your data? Look no further!
In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
|
by: isladogs |
last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM).
In this month's session, we are pleased to welcome back...
|
by: isladogs |
last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM).
In this month's session, we are pleased to welcome back...
|
by: Vimpel783 |
last post by:
Hello!
Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
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by: jfyes |
last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
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by: ArrayDB |
last post by:
The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...
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by: CloudSolutions |
last post by:
Introduction:
For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
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by: af34tf |
last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you
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by: Faith0G |
last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
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