Create rule to restrict special characters in table in sql server

Question

I want to create a rule to restrict special characters to be entered into a column. I have tried the following. But it didnt work.

CREATE RULE rule_spchar
AS
@ma         


        

Answer 1

Your can create a Check Constraint on this column and only allow Numbersand Alphabets to be inserted in this column, see below:

Check Constraint to only Allow Numbers & Alphabets

ALTER TABLE Table_Name 
ADD CONSTRAINT ck_No_Special_Characters 
       CHECK (Column_Name NOT LIKE '%[^A-Z0-9]%') 

Check Constraint to only Allow Numbers

ALTER TABLE Table_Name 
ADD CONSTRAINT ck_Only_Numbers 
       CHECK (Column_Name NOT LIKE '%[^0-9]%') 

Check Constraint to only Allow Alphabets

ALTER TABLE Table_Name 
ADD CONSTRAINT ck_Only_Alphabets 
       CHECK (Column_Name NOT LIKE '%[^A-Z]%')