by: Mansoor Azam |
last post by:
When I add a unique key constraint to column in SQL 6.5 why does it also
create an index. e.g. In the table subaccounts I added a unique key
constraint for the column login and SQL creates an index...
|
by: Kamil |
last post by:
Hello
What should I use for better perfomance since
unique constraint always use index ?
Thanks
Kamil
|
by: Q. John Chen |
last post by:
All,
What's the difference between a unique contraint and unique?
sementically, if you want a column contain unique values, it is a
contraint. And an index is for searching/sort. The questions...
|
by: João Santa Bárbara |
last post by:
Hi all
i have a problem with my sql dataadapter, i think.
i have this table below ( Script ) and this table has one particularity, it
has 2 unique constraints.
when i´m filling my datatable...
|
by: Paul Reddin |
last post by:
Hi,
We have been having many issues with unique constraints and we seem to
have boiled it down to the equivalent of the following very simple
scenario...
given a table with a unqiue...
|
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: Mark Halliday |
last post by:
I'm writing a windows app that uses sql server. Some of my entities have
properties that must be unique. I'm not sure whether I should be performing
manual checks on save or use the unique...
|
by: Phil Latio |
last post by:
I am inserting data into user table which contains 5 fields, sounds simple
enough normally but 2 of the fields are designated as UNIQUE. If someone
does enter a value which already exists, how do I...
|
by: Bobby Edward |
last post by:
I have an xsd dataset. I created a simple query called GetDataByUserId. I
can preview the data fine!
I created a very simple BLL function that calls it and returns a datatable.
When I run...
|
by: Charles Arthur |
last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
|
by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
|
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:
1. The motherboard and BIOS support RAID configuration.
2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
|
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,...
|
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...
|
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...
|
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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