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Normalization

Thread began 6/13/2011 9:41 pm by madelectrical386948 | Last modified 6/30/2011 5:48 pm by madelectrical386948 | 3734 views | 33 replies

Jenny I

Hi Mike

I was suggesting the AS operater is used when you need to join a table more than once in a mysql query. It is used so when you create your recordset you can have different recordset bindings for each of your options. So e.g. options1 is fake but it helps to distinguish your other options fields.

To help trouble shoot I created a mock database of your tables to see if I could get the query to work. My table was based on the first sample I gave you.

Quote:
Company Index Table

companyIndexID (primary key) INT
companyID INT
optionsID INT
2. You should then have the company table which should look something like this

Quote:
Company Table

companyID (primary key) INT
companyName VARCHAR
companyShortName VARCHAR
CompanyAddressNo VARCHAR
companyAddressLine1 VARCHAR
companyAddressline2 VARCHAR
companyCity VARCHAR
companyState VARCHAR
companyZipCode VARCHAR
3. Next your options table can be set up like this

Quote:
options Table

optionsID (primary key)
optionName VARCHAR


Your data should look something like this

ID
1. Facebook
2. Twitter
3. Webpage

etc
If you wanted your company index table to have more that one option selected you could add

Quote:
Company Index Table

companyIndexID (primary key) INT
companyID INT
options1ID INT
options2ID INT
options3ID INT
options4ID INT

I was able to get this to work using the following query

  SELECT companyindex.companyindexID, companyindex.companyID, companyindex.options1ID, companyindex.options2ID, companyindex.options3ID, companyindex.option4ID, company.companyname, options1.optionName, options2.optionName, options3.optionName, options4.optionName
FROM companyindex
INNER JOIN options AS options1 ON companyindex.options1ID = options1.optionsID
INNER JOIN options AS options2 ON companyindex.options2ID = options2.optionsID
INNER JOIN options AS options3 ON companyindex.options3ID = options3.optionsID
INNER JOIN options AS options4 ON companyindex.option4ID = options4.optionsID
INNER JOIN company ON companyindex.companyID = company.companyID  



I have attached an image just to show the result I came up with. Once this is working you will need to bind the recordsets fields to your page to display the data. When you bind to the page it would look something like this

  <?php echo $row_WADAcompanyindex['optionName']; ?>  



Each time you bind to the page you will need to prepend the options created using AS so

  To display option 1 (e.g facebook)
<?php echo $row_WADAcompanyindex['options1.optionName']; ?>

To display option 2 (e.g twitter)
<?php echo $row_WADAcompanyindex['options2.optionName']; ?>

To display option 3 (e.g Youtube)
<?php echo $row_WADAcompanyindex['options3.optionName']; ?>

To display option 4 (e.g Web)
<?php echo $row_WADAcompanyindex['options4.optionName']; ?>  



Just a little note I have used INNER JOIN but you should use LEFT JOIN, the results are exactly the same but INNER JOIN can cause problems at times.

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