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04.29.2008 at 05:10AM PDT, ID: 23361709
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queries for a 1 to many attribute/value schema

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9.3
Zones:

MySQL Server, Databases Miscellaneous

Tags:

sql
Hi Everyone,

Very much hoping you can help me with 2 queries I am trying to figure out. I have attached a sample set of tables. The schema maps an item to many attribute/values. I have opted to store values in a table where the values are stored as proper datatypes rather than as just varchars which complicates matters.

The attached code features at the bottom the 2 desired result sets I need. In one scenario I am happy to have a row per attribute value per item, whereas in the 2nd I would like a pivot scenario for all attributes.

If anyone can help I'd be very grateful.

Best wishes. AC.
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item i
==============
id | title
--------------
1  | My Item 1
2  | My Item 2
 
 
attributes a
====================
id | name   | type
--------------------
1  | fruit  | varchar
2  | weight | int
 
 
attribute_values av
==========================
id | val_varchar | val_int
--------------------------
1  | apples      | NULL
2  | banana      | NULL
3  | NULL        | 9
4  | NULL        | 6
 
 
items_attributes_values iav
=================================
item_id | attribute_id | value_id
---------------------------------
1       | 1            | 1
1       | 2            | 3
2       | 1            | 2
2       | 2            | 4
 
 
Desired Result Set 1
========================
i.id | a.name | av.val_?
------------------------
1    | fruit  | apples
1    | weight | 9
2    | fruit  | banana
2    | weight | 6
 
 
Desired Result Set 2
========================
i.id | fruit | weight
------------------------
1    | apples| 9
2    | banana| 6
 
Accepted Solution by ptttr:

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20081119-EE-VQP-46 / EE_QW_2_20070628