Sql 2008 nested case statement

Question

I have a question about understanding nested case statements in sql server 2008:
 The sql looks like the folloiwng:
 select numberofcases
  from inventory
  where inventory_cnt > 1000
  (when select top 1
    from inventory
     where  inventory_cnt > 750
  then  numberofcases = 750 * 30
  when select top 2
    from inventory
     where  inventory_cnt > 975
  then  numberofcases = 975 * 35
   when select top 3
    from inventory
     where  inventory_cnt > 1025
  then  numberofcases = 1025 / 10
  when select top 4
    from inventory
     where  inventory_cnt > 1050
  then  numberofcases = 1050 / 5) c * 2
   as casesused, select CustomerNumber from inventory
I would like you to explain the following:
1. There are 4 when statements. Will the logic hit each when statemnet or will the logic
   stop once the first when statement is true?
2. Would you explain what the c* 2 means from the school listed above?

Answer 1

Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. Temporal data should
use ISO-8601 formats. Code should be in Standard SQL as much as possible and not local dialect. 
This is minimal polite behavior on SQL forums. 
 SELECT CASE 
        WHEN Inventory_cnt > 1050 THEN 1050 / 5
        WHEN Inventory_cnt > 1025 THEN 1025 / 10
        WHEN Inventory_cnt > 750 THEN 750 * 30
        WHEN Inventory_cnt > 975 THEN 975 * 35
        ELSE NULL END AS cases_used
 FROM Inventory;
I would like you to explain the following:
>> 1. There are 4 when statements. Will the logic hit each when statement or will the logic stop once the first when statement is true? <<
This code is garbage, not SQL. CASE is an expression, not a statement. Expressions return a scalar value. Your are trying to do control flow! And the answer is that a CASE works this way
1) look at the THEN clauses and determine the data type to use
2) test each WHEN clause and execute the first one that tests TRUE in left to right order. 
>> 2. Would you explain what the c* 2 means from the school listed above? <<
Syntax error and more garbage code. 
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