Question

This is a complicated question, so please bear with me. I am using 3 different tables to make 1 result set. They are as follows:

customer_address_entity
    entity_id | entity_type_id | attribute_set_id | increment_id | parent_id | create_at | update_at | is_active

customer_entity_int
    value_id | entity_type_id | attribute_id | entity_id | value


customer_address_entity_varchar
    value_id | entity_type_id | attribute_id | entity_id | value

Ok, so now you have the structure, here is my SQL call I have built so far:

SELECT CAE.entity_id, 
       CEI.value AS default_entity_id, 
       CAEV.attribute_id, 
       CAEV.value 
FROM   customer_address_entity AS CAE 
       JOIN customer_entity_int AS CEI 
         ON CEI.entity_id = CAE.parent_id 
            AND CEI.attribute_id = '13' 
       JOIN customer_address_entity_varchar AS CAEV 
         ON CAEV.entity_id = CAE.entity_id 
WHERE  CAE.parent_id = '2328' 
       AND CAE.is_active = 1 

This outputs the following example dataset:

 ID     default  att   value

'1567', '1567', '19', 'John'
'1567', '1567', '21', 'Doe'
'1567', '1567', '23', 'Johns Company'
'1567', '1567', '25', 'Johns City'
'1567', '1567', '26', 'Johns Country'
'1567', '1567', '27', 'Johns State'
'1567', '1567', '29', 'Johns Zip Code'
'1567', '1567', '30', 'Johns Phone'
'1567', '1567', '31', 'Johns Fax'
'1568', '1567', '19', 'Jane'
'1568', '1567', '21', 'Doe'
'1568', '1567', '23', 'Janes Company'
'1568', '1567', '25', 'Janes City'
'1568', '1567', '26', 'Janes Country'
'1568', '1567', '27', 'Janes State'
'1568', '1567', '29', 'Janes Zip'
'1568', '1567', '30', 'Janes Phone'
'1568', '1567', '31', 'Janes Fax'
'1569', '1567', '19', 'Frank'
'1569', '1567', '21', 'Frunz'
'1569', '1567', '23', 'Franks Company'
'1569', '1567', '25', 'Franks City'
'1569', '1567', '26', 'Franks Country'
'1569', '1567', '27', 'Franks State'
'1569', '1567', '29', 'Franks Zip'
'1569', '1567', '30', 'Franks Phone'
'1569', '1567', '31', 'Franks Fax'

The final part of this code, I would like to create X number (in this case 3) of ROWS based on the number UNIQUE entity_id (Column 1 in returned data set ie .1567,1568 and 1569). The intended end result being:

'1567', '1567', 'John', 'Doe', 'Johns Company', 'Johns City', 'Johns State', 'Johns Zip Code', 'Johns Phone', 'Johns Fax'
'1568', '1567', 'Jane', 'Doe', 'Janes Company', ...  etc
'1569', '1567', 'Frank', 'Franz', 'Franks Comapny', ...   etc        

Is this even possible?

EDIT Thanks to Gordon Linoff — The answer is elegant and simple! I threw in a few edits of my own, but will be accepting Gordons answer and voting it up. Here are the edits I made, which work beautifully!!

select entity_id,
   if(entity_id = default_entity_id, 'true', 'false') as default_entity,
   max(case when attr = '19' then `value` end) as `FirstName`,
   max(case when attr = '21' then `value` end) as `LastName`,
   max(case when attr = '23' then `value` end) as `CompanyName`,
   max(case when attr = '25' then `value` end) as `City`,
   max(case when attr = '27' then `value` end) as `State`,
   max(case when attr = '29' then `value` end) as `ZipCode`,
   max(case when attr = '30' then `value` end) as `PhoneNumber`,
   max(case when attr = '31' then `value` end) as `Fax`

from (SELECT CAE.entity_id, CEI.value AS default_entity_id, CAEV.attribute_id AS attr, CAEV.value 
  FROM   customer_address_entity CAE 
         JOIN customer_entity_int CEI 
           ON CEI.entity_id = CAE.parent_id 
              AND CEI.attribute_id = '13' 
         JOIN customer_address_entity_varchar CAEV 
           ON CAEV.entity_id = CAE.entity_id 
  WHERE  CAE.parent_id = '2328' 
         AND CAE.is_active = 1
 ) as t
group by entity_id

Answer 1

You can do this with a group by:

select entity_id,
       MAX(default) as default,
       max(case when att = '19' then value end) as FirstName,
       max(case when att = '21' then value end) as LastName,
       max(case when att = '23' then value end) as CompanyName,
       max(case when att = '25' then value end) as City,
       max(case when att = '27' then value end) as State,
       max(case when att = '29' then value end) as ZipCode,
       max(case when att = '30' then value end) as PhoneNumber,
       max(case when att = '31' then value end) as Fax
from (SELECT CAE.entity_id, CEI.value AS default_entity_id, CAEV.attribute_id, CAEV.value 
      FROM   customer_address_entity CAE 
             JOIN customer_entity_int CEI 
               ON CEI.entity_id = CAE.parent_id 
                  AND CEI.attribute_id = '13' 
             JOIN customer_address_entity_varchar CAEV 
               ON CAEV.entity_id = CAE.entity_id 
      WHERE  CAE.parent_id = '2328' 
             AND CAE.is_active = 1
     ) t
group by entity_id

This process is called pivoting and aggreagtion is one solution (some databases have a pivot keyword for this). This assumes that each value appears only once per entity. Also, if a value is not present, it will get the value NULL.