Question

I have the following SQL statement:

WITH w1 AS (SELECT [Number] AS v1 FROM [MyTable] WHERE <condition>)
SELECT
  SUM(CASE WHEN v1 < @Value THEN v1 ELSE @Value END)
FROM
  w1;

I’m just curious, say if MyTable contains 10 records matching to , how many times will the statement be processed while performing the SQL statement above?

Answer 1

That will just get inlined and treated the same as if you had written

SELECT SUM(CASE WHEN [Number] < @Value THEN [Number] ELSE @Value END)
FROM [MyTable] 
WHERE <condition>