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by: John Simmons |
last post by:
How is it that even though I have the column "username" in my database set
as a Primary key, using my PHP script to add new users to the database works
without any errors even when signing up using an existing username. I have a
database full of the same usernames!
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by: Westcoast Sheri |
last post by:
Which will be a faster lookup of an item by, "color" in the following
mySQL tables: "unique key," "primary key," or just plain "key"??
CREATE TABLE myTable (
number int(11) NOT NULL default '0',
description varchar(50) NOT NULL default '',
color varchar(30) NOT NULL default '',
price decimal(3,2) NOT NULL default '0.00',
UNIQUE KEY (color)
);
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by: Bob C. |
last post by:
I want to create a 1-many relationship. Parent table has a primary
key, child table has no primary key. The child table does have an
index with all four fields of the parent's PK. How can I do this?
Thanks, Bob C.
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by: Ghulam Farid |
last post by:
Hi
i have a table with primary key defined on col1 and col2. now i want to
have col3 also included in primary key. when i alter the table it gives
me error for duplicate rows. there is an option for 'with nocheck' but
it only works with check or foreign key constraint. is there any option
in sql server like in oracle 'no validate' which doesnt validate the
existing data and force the data validation from new records.
thanx
Farid
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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 but is it normal to have 1/3 of the
table's fields as indexes? Is this a valid question or it really
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by: Lucas Gump |
last post by:
Is it possible to add primary keys to a table one-time and there are
already
multiple primary key defined?
I have to change sp_id, so_id as primary keys to the existing primary
keys
dn_slot_id and dn_mm_id.
I tried several times but all failed:
1. alter table debit_slot_detail add primary key (sp_id, so_id);
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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 tables, it is
possible , by error, to create such an index without the unique
attribute. DB2 UDB 8.1.5 Linux uses such an index for the primary key
anyway, thus losing the unique property of the primary key. Is this a
bug or a feature, i.e. a...
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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. Then what is the exact
difference between the Primary key and the Unique index?
Also which on data retrival..internally it uses the Primary key index
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by: leah |
last post by:
I encountered problem when i tried to create a primary key in an
existing table which does not have one yet. There are too many records
in it and it's hard to find out which one is 'duplicated'.
I'm not sure whether, if there is any duplicate records in the table.
How can i solve this problem?
Thanks
leah
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by: CourtGuy |
last post by:
Hi Folks,
I've got a problem that's been confounding me for months.
I work for a criminal court, and I'm trying to set up an Access database to track petitions filed by criminal defendants.
I am using the court's case file number record as the primary key to make sure the database doesn't wind up with multiple entries for the same case number.
However, a single case number can have other defendants charged in the same case number who...
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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...
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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: 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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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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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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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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