CASE Statement in query - sql

Question

I am trying to return a bunch of values in a table without causing "duplicate" outputs. I thought a CASE statement or derived table may help? Any input would be great.
Within the column Product_code there are the following values
(AFF,E,H,PD,PDM,PDRL,PDRM etc)
Here is my SQL:
SELECT DISTINCT
[Member Id] = c.master_customer_id,
[Full Name] = c.label_name,
[First Name] = c.first_name,
[Last Name] = c.last_name,
[Email] = ISNULL(c.primary_email_address,''),
[Annual Meeting] = MAX(ca.product_code)
CASE WHEN od.product_code IN (AFF,E,H,PD,PDM,PDRL,PDRM) then ??
--[Membership Type] = od.product_code
FROM order_detail od
INNER JOIN customer c
on c.master_customer_id = od.ship_master_customer_id
and c.sub_customer_id = od.ship_sub_customer_id
and od.subsystem = 'MBR'
INNER JOIN cus_activity ca
on ca.master_customer_id = c.master_customer_id
and ca.sub_customer_id = c.sub_customer_id
and ca.subsystem = 'MTG'
and ca.activity_subcode IN ('2012AM', '2011AM')
and ca.product_code IN ('2012AM','2011AM')
INNER JOIN cus_address caddr
on caddr.master_customer_id = c.master_customer_id
and caddr.sub_customer_id = c.sub_customer_id
INNER JOIN cus_address_detail caddrd
on caddrd.cus_address_id = caddr.cus_address_id
where c.customer_class_code NOT IN ('STAFF', 'TEST_MBR')
and c.customer_status_code = 'ACTIVE'
and c.primary_email_address IS NOT NULL
and ca.master_customer_id IN (select order_detail.ship_master_customer_id
from order_detail where order_detail.subsystem = 'MBR')
and caddrd.priority_seq = 0
and caddrd.address_status_code = 'GOOD'
and od.product_code in
( 'AFF','E','H', 'PD','PDM','PDRL','PDRM','PDRU','R',
'RM','RRL','RRM','RRU','S','SM','SRL','SRM','SRU','SU','SUM','SURL','SURM','SURU' )
and od.cycle_end_date >= '01/01/2011' and od.cycle_end_date <= '12/31/2012'
GROUP BY c.master_customer_id,c.label_name,
c.FIRST_NAME,c.LAST_NAME,c.primary_email_address,od.product_code,caddr.country_descr
order by c.master_customer_id

Answer 1

You are looking for a Cross-Tab result (also known as a Pivot table) based on a given customer. You want all possible membership status levels as a person could be multiple levels (per your example).
With the group by on the customer ID, everything will roll-up to the member. So, if there are multiple product codes, I have applied SUM() based on each individual "product_code" you wanted to consider.
Next, to help optimize your query, I would ensure your Order_Detail has an index on
( SubSystem, Product_Code, Cycle_End_Date, ship_master_customer_id )
I've slightly rewritten to better allow myself to follow what you were getting and the criteria related to each table. Hopefully it makes sense to what you started with.
SELECT
c.master_customer_id as [Member Id],
c.label_name as [Full Name],
c.first_name as [First Name],
c.last_name as [Last Name],
ISNULL(c.primary_email_address,'') as [Email],
MAX(ca.product_code) as [Annual Meeting],
SUM( CASE WHEN od.product_code = 'AFF' then 1 else 0 end ) as Membership_AFF,
SUM( CASE WHEN od.product_code = 'E' then 1 else 0 end ) as Membership_E,
SUM( CASE WHEN od.product_code = 'H' then 1 else 0 end ) as Membership_H,
SUM( CASE WHEN od.product_code = 'PD' then 1 else 0 end ) as Membership_PD,
SUM( CASE WHEN od.product_code = 'PDM' then 1 else 0 end ) as Membership_PDM,
SUM( CASE WHEN od.product_code = 'PDRL' then 1 else 0 end ) as Membership_PDRL,
SUM( CASE WHEN od.product_code = 'PDRM' then 1 else 0 end ) as Membership_PDRM
FROM
order_detail od
INNER JOIN customer c
on od.ship_master_customer_id = c.master_customer_id
and od.ship_sub_customer_id = c.sub_customer_id
and c.customer_class_code NOT IN ('STAFF', 'TEST_MBR')
and c.customer_status_code = 'ACTIVE'
and c.primary_email_address IS NOT NULL
INNER JOIN cus_activity ca
on od.ship_master_customer_id = ca.master_customer_id
and od.ship_sub_customer_id = ca.sub_customer_id
and ca.subsystem = 'MTG'
and ca.activity_subcode IN ('2012AM', '2011AM')
and ca.product_code IN ('2012AM','2011AM')
INNER JOIN cus_address caddr
on od.ship_master_customer_id = caddr.master_customer_id
and od.ship_sub_customer_id = caddr.sub_customer_id
INNER JOIN cus_address_detail caddrd
on caddr.cus_address_id = caddrd.cus_address_id
and caddrd.priority_seq = 0
and caddrd.address_status_code = 'GOOD'
WHERE
od.subsystem = 'MBR'
and od.product_code in ( 'AFF','E','H','PD','PDM','PDRL','PDRM','PDRU',
'R','RM','RRL','RRM','RRU','S','SM','SRL',
'SRM','SRU','SU','SUM','SURL','SURM','SURU' )
and od.cycle_end_date >= '01/01/2011'
and od.cycle_end_date <= '12/31/2012'
GROUP BY
od.ship_master_customer_id,
c.label_name,
c.FIRST_NAME,
c.LAST_NAME,
c.primary_email_address,
caddr.country_descr
order by
od.ship_master_customer_id