How to partial match words within a string - TSQL - tsql

Question

I have a table called Keywords that 100's of keywords ranging from one word to several, all separated by commas. For example:
change of name, asb, repair, reporting violence
These keywords are grouped into categories.
We have users who can enter any text into a free text field. Example:
Caller rang to to speak to ASB about violence
How do I use SQL to read the words in the free text field to check for any matches in the keyword table? So in the example above I want it to pick up that ASB and Violence was stored in the Keyword table.
I would also want it bring back a result if only one word was used like ASB.
It's important to note that any words could be entered into the free text field.
I'm using Microsoft SQL Server 2014 SP2.
Thanks

Answer 1

As you have not specified your table names; I will create some. Please run this:
create table dbWords (id int not null identity, words varchar(100), primary key (id))
insert into dbWords (words) values ('change of name, asb, repair, reporting violence')
CREATE FUNCTION [dbo].[fnSplitString]
(
#string NVARCHAR(MAX),
#delimiter CHAR(1)
)
RETURNS #output TABLE(splitdata NVARCHAR(MAX)
)
BEGIN
DECLARE #start INT, #end INT
SELECT #start = 1, #end = CHARINDEX(#delimiter, #string)
WHILE #start < LEN(#string) + 1 BEGIN
IF #end = 0
SET #end = LEN(#string) + 1
INSERT INTO #output (splitdata)
VALUES(SUBSTRING(#string, #start, #end - #start))
SET #start = #end + 1
SET #end = CHARINDEX(#delimiter, #string, #start)
END
RETURN
ENd
Then run this:
select * from dbWords inner join (
select * from dbo.fnSplitString('change of name, change of dob', ',')
) as splitdatatable on dbwords.words like '%,' + splitdata+ ',%'
or dbwords.words like '%,' + splitdata
or dbwords.words like splitdata + ',%'
The text passed to the function in the SQL statement above is the text entered by the user.