SQL Server：多个Where子句

Question

Suppose I have a T-SQL command with multiple WHERE conditions like this:

SELECT * 
FROM TableName
WHERE Column1 NOT LIKE '%exclude%'
  AND Column2 > 10

Would the query exclude a row as soon as Column1 was not met or would it still go on to test the next condition for Column2 ?

I am asking because I want to see if it would be more efficient to swap my conditions around to first test if Column2 > 10 before I run a more time-consuming condition.

Edit: If it matters, Column1 is of type bigint and Column2 is of type ntext

Answer 1

Sql will devise a query plan based on available indexes and statistics. Sql doesn't necessarily have "short-circuit" expression evaluation per se because it is a procedural language but ultimately the query plan will perform short-circuit evaluation.

Swapping the expressions should not affect performance.

Answer 2

As Marc said, swapping columns in where clause will not make any change in performance. Instead, you could look for changing the data type NTEXT into nvarchar(X) where x represents some meaningful data length.