Syntax Error in CASE STATEMENT - sql

Question

Here is my select statement. What I'm trying to do is if an account has more than one ID, I want the phone number to be NULL, ELSE I want the phone number to = phone_number_formatted:
SELECT
v_returned_inventory.order_id,
v_live_inventory.inet_event_description,
v_live_inventory.event_time,
v_cust_phone.phone_number_formatted,
v_live_inventory.event_date,
v_returned_inventory.section_name,
v_returned_inventory.add_usr,
v_live_inventory.num_seats,
v_returned_inventory.acct_id,
v_live_inventory.class_name,
AT_trans_for_emailTrigger.email_addr,
AT_trans_for_emailTrigger.cust_name_id,
premclub.name_first + ' ' + premclub.name_last AS name
FROM
v_returned_inventory
INNER JOIN
v_live_inventory
ON
LEFT(v_returned_inventory.event_name, 6) = LEFT(v_live_inventory.event_name, 6)
AND v_returned_inventory.orderNumber = v_live_inventory.other_info_1 INNER JOIN
AT_trans_for_emailTrigger
ON v_returned_inventory.order_id = AT_trans_for_emailTrigger.order_id
LEFT OUTER JOIN
v_cust_phone
on v_cust_phone.acct_id = v_returned_inventory.acct_id
LEFT OUTER JOIN
OPENQUERY(premclub, 'select name_first, name_last, cust_name_id from dba.v_cust_name') AS premclub
ON AT_trans_for_emailTrigger.cust_name_id = premclub.cust_name_id,
**CASE
WHEN (select
count(cust_name_id)
from
v_cust_phone) > 1 then null
else v_cust_phone.phone_number_formatted
END**

Answer 1

You have the CASE statement in the wrong place, it needs to be in the SELECT. Based on what you currently have, it appears that you might be able to do something like this:
SELECT v_returned_inventory.order_id,
v_live_inventory.inet_event_description,
v_live_inventory.event_time,
case when phone.cnt > 1 then null else v_cust_phone.phone_number_formatted end phone_number_formatted,
v_live_inventory.event_date,
v_returned_inventory.section_name,
v_returned_inventory.add_usr,
v_live_inventory.num_seats,
v_returned_inventory.acct_id,
v_live_inventory.class_name,
AT_trans_for_emailTrigger.email_addr,
AT_trans_for_emailTrigger.cust_name_id,
premclub.name_first + ' ' + premclub.name_last AS name
FROM v_returned_inventory
INNER JOIN v_live_inventory
ON LEFT(v_returned_inventory.event_name, 6) = LEFT(v_live_inventory.event_name, 6)
AND v_returned_inventory.orderNumber = v_live_inventory.other_info_1
INNER JOIN AT_trans_for_emailTrigger
ON v_returned_inventory.order_id = AT_trans_for_emailTrigger.order_id
LEFT OUTER JOIN v_cust_phone
on v_cust_phone.acct_id = v_returned_inventory.acct_id
LEFT OUTER JOIN
(
select count(cust_name_id) cnt, cust_name_id
from v_cust_phone
group by cust_name_id
) phone
on v_cust_phone.cust_name_id = phone.cust_name_id
LEFT OUTER JOIN OPENQUERY(premclub, 'select name_first, name_last, cust_name_id from dba.v_cust_name') AS premclub
ON AT_trans_for_emailTrigger.cust_name_id = premclub.cust_name_id