SELECT distinct values for multiple rows of same ID

Question

I have a table that looks like this:

ID | FIELD_NAME   | VALUE
23 |  sign_up     |  yes
23 |  first_name  |  Fred
23 |  street      |  Barber Lane
24 |  sign         


        

Answer 1

Am not sure there is a Pivot/Unpivot feature in MySQL. Try this:

SELECT a.ID, 
       c.FIELD_NAME AS SIGN_UP,
       a.FIELD_NAME AS FIRST_NAME,
       b.FIELD_NAME AS STREET

  FROM  a LEFT JOIN  b
        ON a.ID = b.ID 
     AND a.FIELD_NAME = 'first_name'
     AND b.FIELD_NAME = 'street' LEFT JOIN  c
        ON c.ID = a.ID
     AND c.FIELD_NAME = 'sign_up'