Create related records based on string in SQL Server - sql

Question

I need to create a query that takes rows from a table and inserts into a related table all the splitted strings.
Example:
In table Keywords I have the row:
Id Name
1 RENAULT CLIO MTV
And I need to create a query that takes the row and create 1 row for each word like this:
In the table KeywordSearches:
Id: (Identity Increment)
Name: RENAULT
Keyword_Id: 1
Id: (Identity Increment)
Name: CLIO
Keyword_Id: 1
Id: (Identity Increment)
Name: MTV
Keyword_Id: 1
I need to be able to create all the related Keyword Search based on every rows of the table Keywords.
Thanks.

Answer 1

One way to get the list of keywords is to use a recursive CTE:
with keywords as (
select 1 as id, 'RENAULT CLIO MTV' as keywords union all
select 2 as id, 'A B' as keywords
),
cte as (
select id,
(case when keywords like '% %'
then left(keywords, charindex(' ', keywords))
else keywords
end) as keyword,
(case when keywords like '% %'
then substring(keywords, charindex(' ', keywords)+1, 1000)
else ''
end) as rest
from keywords
union all
select id,
(case when rest like '% %'
then left(rest, charindex(' ', rest))
else rest
end) as keyword,
(case when rest like '% %'
then substring(rest, charindex(' ', rest)+1, 1000)
else ''
end) as rest
from cte
where len(rest) > 0
)
select id, keyword
from cte;
Using the same structure, you can replace the final select with an insert:
insert into KeywordSearches(name, keyword_id)
select keyword, id
from CTE;
This assumes that you have set up the id as an identity column.
Here is a SQLFiddle for the first query.
EDIT:
I think the final query would be something like:
with cte as (
select id,
(case when keywords like '% %'
then left(keywords, charindex(' ', keywords))
else keywords
end) as keyword,
(case when keywords like '% %'
then substring(keywords, charindex(' ', keywords)+1, 1000)
else ''
end) as rest
from keywords
union all
select id,
(case when rest like '% %'
then left(rest, charindex(' ', rest))
else rest
end) as keyword,
(case when rest like '% %'
then substring(rest, charindex(' ', rest)+1, 1000)
else ''
end) as rest
from cte
where len(rest) > 0
)
insert into KeywordSearches(name, keyword_id)
select keyword, id
from CTE;