Search for a word in the column string and list those words - sql

Question

Have two tables, table 1 with columns W_ID and word. Table 2 with column N_ID and note. Have to list all the NID where words found in table 1 word column contains in Note column (easy part) and also list those words in another column without duplicating the N_ID. Which means using STUFF to concatenate all the words found in Note column for that particular N_ID. I tried using
FULL TEXT INDEX using CONTAIN
But it only allows to search for one word at a time. Any suggestions how I can use a while loop to achieve this.

Answer 1

If there is a maximum number of words you want displayed for N_ID, you can pivot this. You could have them in a single column by concatenating them, but I would recommend against that. Here is a pivot that supports up to 4 words per N_ID. You can adjust it as needed. You can view the SQL Fiddle for this here.
SELECT
n_id,
[1] AS word_1,
[2] AS word_2,
[3] AS word_3,
[4] AS word_4
FROM (
SELECT
n_id,
word,
ROW_NUMBER() OVER (PARTITION BY n_id ORDER BY word) AS rn
FROM tbl2
JOIN tbl1 ON
tbl2.note LIKE '%'+tbl1.word+'[ ,.?!]%'
) AS source_table
PIVOT (
MAX(word)
FOR rn IN ([1],[2],[3],[4])
) AS pivot_table
*updated the join to prevent look for a space or punctuation to declare the end of a word.

Answer 2

You can join your tables together based on a postive result from the charindex function.
In SQL 2017 you can run:
SELECT n_id, string_agg(word)
FROM words
inner join notes on 0 < charindex(words.word, notes.note);
Prior to SQL 2017, there is no string_agg so you'll need to use stuff, which is trickier:
select
stuff((
SELECT ', ' + word
FROM words
where 0 < charindex(words.word, notes.note)
FOR XML PATH('')
), 1, 2, '')
from notes;
I used the following schema:
CREATE table WORDS
(W_ID int identity primary key
,word varchar(100)
);
CREATE table notes
(N_ID int identity primary key
,note varchar(1000)
);
insert into words (word) values
('No'),('Nope'),('Nah');
insert into notes (note) values
('I am not going to do this. Nah!!!')
,('It is OK.');