mysql - Database approach for different product types -



mysql - Database approach for different product types -

my e-commerce application has different product/service types listed. each product/service type has different properties/attributes. example, mobile phone have different attributes cdma/gsm , tv have different set of attributes usb/hdmi. many product types available in starting , maintain on adding different product/service types.

so question is, should need have different table each product/service type in database because each product/service has different attributes (columns) or there different, improve approach? estimated count of product/service types 50+.

your case instance of class/subclass or type/subtype. buzzphrase in er modeling "generalization/specialization".

here's list of tags pertain questions yours:

single-table-inheritance class-table-inheritance shared-primary-key

if read tag wiki these 3 tags, you'll general pointers on designing case outline. in addition, questions tagged 3 tags contains answers help you.

if you'd little more research on web, recommend martin fowler's web pages outlines single table inheritance , class table inheritance. covers basics well. if still want go deeper, you'll need consult textbook.

all of these techniques arise out of fact neither relational info model nor vanilla sql had mechanism providing inheritance modeler.

mysql database database-design

Comments

Post a Comment

Popular posts from this blog

php - How to pass multiple values from url -

php - How to pass multiple values from url - i'm trying pass textbox , 1 select result value 1 page page.using url.but it's display error message. "parse error: syntax error, unexpected '' (t_encapsed_and_whitespace), expecting identifier (t_string) or variable (t_variable) or number (t_num_string) in c:.." while($value= mysqli_fetch_assoc($result)){ $apid=$value['apid']; echo("<tr> <td>". $value['apid'] ."</td> <td>".$value['email']."</td> <td>".$value['comments']."</td> <td>".'<input type="text" name="payment"/>'."</td> <td>"."<input type='text' name='apid' value='".$apid."' style='visibility:hidden' size='2'>"."</a>"."<a hre...
Read more

xslt - DocBook 5 to PDF transform failing with error: "fo:flow" is missing child elements. Required content model: marker* -

xslt - DocBook 5 to PDF transform failing with error: "fo:flow" is missing child elements. Required content model: marker* - i've inherited doc publishing process takes docbook , builds html , pdf output, using apache fop both. project had been started, never completed. lots of tweaking, i've able of doc sets build (20+), except handful, , fail severe code 1 of these 2 conditions: "fo:flow" missing kid elements. required content model: marker* "fo:block" not valid kid of "fo:root" the xml output comes out of docbook , docbook-fop checks out well-formed. the fop error in 1 book, "endecagloss", example, points end of string: <fo:flow flow-name="xsl-region-body" start-indent="4pc" end-indent="0pt"/> here’s log output in case: [java] severe: javax.xml.transform.transformerexception: file:/scratch/publishing/hudson/jobs/build-main-endeca-documentation/workspace/serverdoc/w...
Read more

database - php search bar when I press submit with nothing in the search bar it shows all the data -

database - php search bar when I press submit with nothing in the search bar it shows all the data - the search fusion works correctly if press submit nil in search bar shows data. how message show saying nil has been entered search bar ?.i new php. <?php $mysql_host="host"; $mysql_database="database"; $mysql_user="username"; $mysql_password="password"; $dbconnect=@mysql_connect($mysql_host, $mysql_user, $mysql_password); // trys connect database if (!$dbconnect) { exit("an error has occurred - not connect database."); // if couldn't connect, allow user know } if(!mysql_select_db($mysql_database)) { exit("an error has occurred - not select database."); //if couldn't select db, allow user know } $output = ''; //collect if(isset($_post['search'])...
Read more