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by: Sanjay Minni |
last post by:
What is the datatype to be used
for Primary Key columns for most
optimised access given that
- There will be a single column primary key only
- The values will only be integers (but as
strings) at least 12 digits (characters) long
- all positions will be occupied (no leading 0's)
- Tables may have upto 1m+ rows
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by: Tuhin Kumar |
last post by:
Hi,
Oracle give the error ORA-01418 when I try to do the
following;
Create unique index t1_pk on TABLE1(EntryId DESC) ;
If the I try to add primary key Contraint using the above index t1_pk
as below:
ALTER TABLE TABLE1 ADD CONSTRAINT TABLE1_PK PRIMARY KEY (EntryId)
USING INDEX t1_pk;
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by: Peter Scott |
last post by:
I created a table that has a column in that needs to contain a full
Unix file path. Since 2048 was too long for a VARCHAR, I made it
TEXT. I since populated the table. Now I want to make the path
column a primary key, and I can't figure out how. (I googled the
web and groups without luck, looked over the reference manual also,
especially...
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by: serge |
last post by:
I ran into a table that is used a lot. Well less than
100,000 records. Maybe not a lot of records but i believe
this table is used often. The table has 26 fields, 9 indexes
but no Primary Key at all!
There are no table relationships defined in this database, no
Natural keys, only Surrogate keys in the database.
1- Maybe an odd question...
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by: Philip |
last post by:
Hey all,
(Access 2000)
I've been having a horror story with this design problem. My Database is
Structured like This: AUTHORS, BOOKS, PAGES. Those are the Tables and each
Item in each table needs a unique ID# based on its context.
Primary Keys
AUTHORS = AuthorID - NO Duplicates
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by: Paul Hunter |
last post by:
I am new to databases and thus to Access. I have a situation where I am
trying to figure out how to key some tables I am working with. Consider that
I have a database of my own records which are invoices I work on. These
invoices are from four companies with their own invoice numbers. So, I
cannot key by invoice number because there is a...
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by: LurfysMa |
last post by:
Most of the reference books recommend autonum primary keys, but the
Access help says that any unique keys will work.
What are the tradeoffs?
I have several tables that have unique fields. Can I use them as
primary keys or should I define an autonum primary key?
One table has information about the 50 states in the US. The table
looks...
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by: mark_aok |
last post by:
Hi all,
I have a situation where I need to determine a specific table's
primary key, and then output it.
I have tried the Database Object, and the Record Object, but I've had
no luck.
Ideally there would be something like,
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by: sachin |
last post by:
Hi,
I am facing some strange issue in DB2 UDB 9.5.1
I have created a database on DPF implemented environment and I tried
to execute following commands
Db2 create table test ( name char(10) not null, acno integer not
null );
Completed successfuly
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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, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main...
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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...
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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, 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. ...
|
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 Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
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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, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
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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...
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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...
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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 we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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