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by: Joy |
last post by:
MySQL automatically creates an index for the primary key. Now, I want to
drop it before I start inserting a million rows of data. Can I drop it at
all? Thanks.
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by: Woody Rao |
last post by:
I'm trying to drop all indexes and primary keys so that i can rebuild them
(from a script created from same database on another server).
when i go to the 'generate sql scripts', it has the ability to drop or
generate all
tables. it also has the ability to generate all keys only. but i cant find
a way
to drop all of these keys...
any ideas?
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by: Ilan Sebba |
last post by:
I am trying to add a record using SQL. My problem is that the primary keys
are foreign keys, and these foreign keys are autonumbers. I therefore do
not know the primary keys of the record I am trying to insert. I therefore
do not think that I can use the sql "Insert Into" command.
Here is a simplified illustration of my tables:
tblFather
NaturalKey1
NatuarlKey2
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by: Geoff Cayzer |
last post by:
At http://www.blueclaw-db.com/tips_tricks.htm I came across a section
which is included below and was hoping for some comment on the
article.
--------------
Almost never use this auto-number field as the primary key of the
table.
If you are thinking of hiring an Access programmer or consultant ask
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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: Thomas A. Anderson |
last post by:
I am a bit confused in creating a composite primary key. I have three table
with two of the tables containing primary keys. I have two of the tables
(each with a primary key) having one to many relations with the table
containing no primary key. Do I just create two primary keys on the table
that does not contain any primary key for this to become a composite primary
key?
Thank you in advance!
Still a newbie,
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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 like this:
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by: Danny |
last post by:
Hello,
We imported a bunch of tables from a database and realized that the
primary keys weren't copied to the destination db. In order to re-
create the keys, we need to know which tables have them. Is there a
command that I can use (on the source db) to find out which tables
contain primary keys? The db has hundreds of tables and I'd rather not
go through each one to see which has a primary key.
Also, for future reference, is there a...
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by: DanicaDear |
last post by:
I have a QTY field and an ITEM field. User inputs a number into the QTY field, then tabs over the the next field and there's a down arrow on the right hand side of the field that you click to choose the correct item from the drop box. The combination of the QTY and the ITEM is the primary key (two primary keys). When I tab over to the ITEM field and press the down arrow, a message box pops up telling me that a primary key field can't be null...
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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 usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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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 synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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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.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
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 most users, this new feature is actually very convenient. If you want to control the update process,...
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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 protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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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 launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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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 instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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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 the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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