SQL Query in StarcounterDB - sql

Question

I have an SQL query problem in my Starcounter database where I want to write a query that retrieves html pages (Content) containing a specific set of keywords based on the following models.
class Keyword {
int Id;
string Text;
}
Example data:
Id Text
1 google
2 advertising
3 twitter
class Content {
int Id;
string Text;
}
Example data:
Id Text
4 "google advertising is nice for marketers"
5 "twitter is not a good way to get exposure"
class HasWord : Relation {
Keyword Keyword;
Content Content;
}
Example data:
Keyword Content
1 4
2 4
3 5
How would I write a Query that retrieves all Content containing 2 specific words, in this case "google" and "advertising"? Is it possible without nested queries?
Input:
"google" & "advertising"
Desired output:
"google advertising is nice for marketers"

Answer 1

If you need to find an instance of Content , which Text contains both words, then you can use operator LIKE with regular expression, which is described here. For example:
SELECT Text
FROM Content
WHERE Text LIKE '%google%' AND Text LIKE '%advertising%'
If you need to find an instance of Content, which is in relationship with both keywords, then you can use self-join. For example
SELECT r1.Content.Text
FROM HasWord r1, HasWord r2
WHERE r1.Content = r2.Content AND
r1.Keyword.Text = 'google' AND r2.Keyword.Text = 'advertising'
Note that the result of the query will contain duplicates.