Find All Special Characters in a SQL Server

Question

I would like to find all Special Characters in a table. I am currently using the code below. Not sure if this gets all of them.
select  top 50 *
from [dbo].[SV20150122]
where street LIKE '%[^0-9a-zA-Z @\.\-]%'
SQL

Answer 1

Depends on what you want to count as a special character.  Depending on your collation, your query might not consider é (for example) as a special character.  The same goes for other accented letters.  If that's what you want, then fine. 
If that is not what you want, you may want to do
where street LIKE '%[^0-9a-zA-Z @\.\-]%' Collate Latin1_General_BIN
In any case, you can see exactly which characters are NOT counted as special characters on your system (with and without the Collate clause) by running
Declare @Test Table(ID int, MyData char(1));
;With cte As
(Select 0 As Number
Union All
Select Number + 1
From cte
Where Number < 255)
Insert @Test(ID, MyData)
Select Number, CHAR(Number)
From cte Option(MaxRecursion 256);
Select ID, MyData From @Test
Except
Select ID, MyData From @Test
Where MyData LIKE '%[^0-9a-zA-Z @\.\-]%'
Select ID, MyData From @Test
Except
Select ID, MyData From @Test
Where MyData LIKE '%[^0-9a-zA-Z @\.\-]%' Collate Latin1_General_BIN
Note: the above code assumes the column street is char or varchar. 
Tom