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Julia Samarska
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11-Jun-2010
Enhanced LINQ to SQL Compatible ORM Solution from Devart
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Assume MySQL int range (unsigned) is from 0 to 4294967295
There are total 10 digits.
Why a lot of tutorial in the web tell you to declare,
e.g.
CREATE TABLE t1 (f INT(11) UNSIGNED);
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11 characters of display allow for any int of any size, signed or
unsigned. When you do not specify a length attribute in a
declaration, MySQL uses 11 as the default.
For your application, use what makes sense for your problem's domain.
- michael dykman
On Mon, Jun 14, 2010 at 12:14 PM, Ryan
AFAIK, the number in parenthesis is ONLY for display purposes in formatting
the size of the column in mySQL command line output, NOT the size of the
data that can be held.
I think they use (11) because unsigned will need one extra character for
the minus sign.
INT SIGNED = -2147483648 to
Hi,
I ran a update command on around 2700 rows inside a mysql database table
which has around 3000 table rows to change the ( say) price of each item (
with unique ID. unique product code).
like:
mysql UPDATE tbl_xyz set listprice='9.45' where prod_id='3069' and
prod_code='a0071';
Query OK,
The only way I could think of is to have a column that's an auto updated
timestamp and then just query using that time.
`updated_on` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE
CURRENT_TIMESTAMP
So for your mass update, I'd SET @updated_time = NOW(); and then you could
use that in
Do you have a timestamp field on this table?
There's no way of seeing when a row was last updated unless you have a
timestamp field that automatically updates for any change (that's *any*
change - not necessarily the ones you want to keep track of) or creating
your own and updating them either on
Hi,
Thank you all for your prompt response. Unfortunately timestamp file isn;t
there, so I will find some other way to do it.
Seems timestamp is a valuable field ( unless you want to save resource on
generating timestamps on a very busy table).
Thanks
Easy enough to rectify
http://dev.mysql.com/doc/refman/5.0/en/alter-table.html
ALTER TABLE `tbl_xyz` ADD COLUMN `updated_on` TIMESTAMP NOT NULL DEFAULT
CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP AFTER `prod_id`;
Personally I put a 'created_on' and an 'updated_on' column for mostly every
Using 5.1.41/Ubuntu
I have 2 tables, members countries. The former has a column,
country_id (tinyint(3) unsigned). The countries id column is the same
(although auto_increment). I'm trying to select just those countries for
which there is a member. So I decided this query should do the
On 10-06-14 09:13 PM, brian wrote:
Using 5.1.41/Ubuntu
I have 2 tables, members countries. The former has a column,
country_id (tinyint(3) unsigned). The countries id column is the same
(although auto_increment). I'm trying to select just those countries for
which there is a member. So I
Frankly speaking ,
Am looking very simple example for 5NF ,
Even i looked the lot of site , in most of the site they given clear
information upto 3NF ,
But can u please tell me , 5NF with example,
Regards
Bharanikumar
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