Question

I have three tables. Foo, Attrib, FooAttrib. Where FooAttrib is the bridge between foo and attrib. As you can see there are many foo’s and many attribs in the table.

 Foo                 FooAttri                          Attrib
 ------------      -----------------------------     --------------
| id |  Name |    | fooId   |  attribId | value |   | id | Descrip |
|----|-------|    |---------|-----------|-------|   |----|---------|  
|  1 |  Sam  |    |  1      |     1     | red   |   |  1 | Color   |
|  2 |  Bill |    |  1      |     2     | Grape |   |  2 | Flavor  |
|  3 |  Ted  |    |  2      |     1     | Blue  |   |  3 | Weight  |
 ------------     |  3      |     3     |  10   |    --------------
                  |  1      |     3     |   5   |
                  |  2      |     3     |   1   |
                   -----------------------------

I know how to get the following:

fooId   Name     Attrib     Value
1       Sam      Color      red     
1       Sam      Flavor     Grape    
1       Sam      Weight     5
2       Bill     Color      Blue
2       Bill     Weight     1
3       Ted      Weight     10

But what I want to know is; Is it possible to build a select statement so that I get foo and attrib data all returned in one result set that looks like the following?

fooId   Name     Color   Flavor   Weight
1       Sam      red     Grape    5
2       Bill     Blue             1
3       Ted                       10

Answer 1

You could do it if you know the total possible arguments you want at select time:

select f.id, f.name, fa_color.value as color, , fa_flavor.value as flavor
from foo f
join fooattri fa_color on f.id = fa_color.fooid and fa_color.attribid = 1
join fooattri fa_flavor on f.id = fa_flavor.fooid and fa_flavor.attribid = 2
...