If CASE Statement can be used just nest to 'WHERE' keyword in sql?

Question

HI All,
There are 2 tables,
 dbo.headcount_smart_view & dbo.headcount_user_view,they
are not joined i.e. there is no join between these 2 tables.
 User is trying to create the access restriction on table
dbo.headcount_smart_view as below,
The following case clause is just next to 'WHERE' keyword :
CASE select distinct dbo.headcount_user_view.role_cd from
dbo.headcount_user_view where UPPER(dbo.headcount_user_view.cmt_id) = UPPER(@Variable('BOUSER'))
WHEN 8 THEN dbo.headcount_smart_view.l3_id In (select distinct
dbo.headcount_user_view.divid from dbo.headcount_user_view
where UPPER(dbo.headcount_user_view.cmt_id)=UPPER(@Variable('BOUSER')))
WHEN 9 THEN dbo.headcount_smart_view.l4_id In (select distinct
dbo.headcount_user_view.divid from dbo.headcount_user_view
where UPPER(dbo.headcount_user_view.cmt_id)=UPPER(@Variable('BOUSER')))
ELSE
dbo.headcount_smart_view.l2_id In (select distinct
dbo.headcount_user_view.divid from dbo.headcount_user_view
where UPPER(dbo.headcount_user_view.cmt_id)=UPPER(@Variable('BOUSER')))
END
The user is getting 'syntax error', it seems that the value is not getting compared with any column hence getting the error.
can case statment  be used just next to 'WHERE' keyword in sql? 

Answer 1

I don't have the entire table query...
but could u tell me wil the sql given below work ....
if not, why? and what can be done to make it work ?
SELECT * FROM Customers 
where case select  CustomerID from customers 
when 8 then 'Spock'
when 9 then 'Yedi'
else 'Jedi'
end;
Nope
because of wrong syntax
What the purpose of the case when statement here? I'm not seeing a condition in WHERE. You should use it in a condition like below
SELECT * FROM Customers
where case CustomerID
when 8 then 'Spock'
when 9 then 'Yedi'
else 'Jedi'
end = @SomeParameter
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