Creating SQL Query references a few tables - sql

Question

I tried to do this myself with views but I unfortunately I don't have the skills or knowledge required.
I've put in some dummy data to demonstrate.
uri of course = object_uri
TABLE_RECORD
+-----+---------------+---------+
| uri | title | client |
+-----+---------------+---------+
| 1 | australia | peter |
| 2 | new zealand | peter |
| 3 | canada | chris |
| 4 | united states | mitch |
| 5 | ireland | michael |
| 6 | scotland | mitch |
+-----+---------------+---------+
TABLE_UDF
+------------+--------------+----------------+
| object_uri | udf_type_uri | udf_type_value |
+------------+--------------+----------------+
| 1 | 2005 | 1/12/2007 |
| 2 | 2005 | 2/04/2008 |
| 2 | 2006 | 3/04/2009 |
| 3 | 2005 | 4/05/2010 |
| 4 | 2006 | 12/04/2016 |
| 5 | 2005 | 14/05/2005 |
| 5 | 2006 | 14/05/2006 |
| 6 | 2005 | 20/01/2017 |
+------------+--------------+----------------+
EXPECTED OUTPUT
+-----+---------------+---------+------------+------------+
| uri | title | client | udf_type_1 | udf_type_2 |
+-----+---------------+---------+------------+------------+
| 1 | australia | peter | 1/12/2007 | |
| 2 | new zealand | peter | 2/04/2008 | 3/04/2009 |
| 3 | canada | chris | 4/05/2010 | |
| 4 | united states | mitch | | 12/04/2016 |
| 5 | ireland | michael | 14/05/2005 | 14/05/2006 |
| 6 | scotland | mitch | 20/01/2017 | |
+-----+---------------+---------+------------+------------+
Thanks heaps in advanced.

Answer 1

If I understand correctly, this is a join with conditional aggregation:
select r.uri, r.title, r.client,
max(case when u.udf_type_uri = 2005 then udf_type_value end) as udf_type_1,
max(case when u.udf_type_uri = 2006 then udf_type_value end) as udf_type_2
from record r join
udf u
on r.uri = u.object_uri
group by r.uri, r.title, r.client;

Answer 2

SELECT
*
FROM
table_record
LEFT JOIN
(
SELECT
object_uri,
MAX(CASE WHEN udf_type_uri = 2005 THEN udf_type_value END) AS udf_type_1,
MAX(CASE WHEN udf_type_uri = 2006 THEN udf_type_value END) AS udf_type_2
FROM
table_udf
GROUP BY
object_uri
)
table_udf
ON table_udf.object_uri = table_record.uri
The inner query squashes the udf table down to one row per uri, and uses MAX() and CASE to ensure the correct udf is placed in the correct column. Then you just join the tables as normal.
(Can also be done using PIVOT, but that's always seems clunkier to me...)
https://technet.microsoft.com/en-us/library/ms177410(v=sql.105).aspx