Number of times a particular character appears in a string

Question

Is there MS SQL Server function that counts the number of times a particular character appears in a string?

Answer 1

Use this code, it is working perfectly. I have create a sql function that accept two parameters, the first param is the long string that we want to search into it,and it can accept string length up to 1500 character(of course you can extend it or even change it to text datatype). And the second parameter is the substring that we want to calculate the number of its occurance(its length is up to 200 character, of course you can change it to what your need). and the output is an integer, represent the number of frequency.....enjoy it.

---

CREATE FUNCTION [dbo].[GetSubstringCount]
(
  @InputString nvarchar(1500),
  @SubString NVARCHAR(200)
)
RETURNS int
AS
BEGIN 
        declare @K int , @StrLen int , @Count int , @SubStrLen int 
        set @SubStrLen = (select len(@SubString))
        set @Count = 0
        Set @k = 1
        set @StrLen =(select len(@InputString))
    While @K <= @StrLen
        Begin
            if ((select substring(@InputString, @K, @SubStrLen)) = @SubString)
                begin
                    if ((select CHARINDEX(@SubString ,@InputString)) > 0)
                        begin
                        set @Count = @Count +1
                        end
                end
                                Set @K=@k+1
        end
        return @Count
end