Question

UPDATED

Finally I used this way to get filtered result.

SELECT * FROM statuses WHERE _id NOT IN (
    SELECT DISTINCT statuses._id FROM statuses, filtered_sources WHERE statuses.source LIKE '%'||filtered_sources.text||'%'
    UNION
    SELECT DISTINCT statuses._id FROM statuses WHERE statuses.screen_name IN(SELECT filtered_users.text FROM filtered_users)
    UNION
    SELECT DISTINCT statuses._id FROM statuses, filtered_keywords WHERE statuses.text LIKE '%'||filtered_keywords.text||'%'
);

Why I use this way instead of combine results directly?

I’d like to use query() method rather than rawQuery() in Android.

@zapi and @sixfeetsix , thank you very much, your answers give me this idea !

Download sqlite database for test here http://db.tt/ZsEwE9TV

I have a sqlite database contains three tables : statuses, filtered_keywords, filtered_sources.

Columns in each tables:

statuses:

|_id|text|source|

filtered_keywords and filtered_sources:

|_id|text|

now I’d like to filter query results from statuses contains words in filtered_keywords and filtered_sources.

I know I can use LIKE in sqlite, but I can’t use it like IN function.

SELECT * FROM statuses WHERE text in (SELECT text FROM filtered_sources);

So I have to query all data in filtered_sources and filtered_keywords as Cursor first, then build a long where clause, it’s really slow.

Is there any simple way to get the filtered result ?

Answer 1

You can do something like this:

SELECT statuses.* 
FROM statuses, filtered_sources
WHERE statuses.text LIKE '%' || filtered_sources.text || '%'
UNION
SELECT statuses.*
FROM statuses, filtered_keywords
WHERE statuses.text LIKE '%' || filtered_keywords.text || '%';';

For example:

create table statuses (_id, text, source);
create table filtered_keywords (_id, text);
create table filtered_sources (_id, text);

insert into statuses values (1, 'foobar', NULL);
insert into statuses values (2, 'foofoobar', NULL);                              
insert into statuses values (3, 'foofoobarbar', NULL);

insert into filtered_keywords values (1, 'foofoo');
insert into filtered_sources values (1, 'barbar');

.headers on
.mode column
.width 3 15 6 

SELECT statuses.* 
FROM statuses, filtered_sources
WHERE statuses.text LIKE '%' || filtered_sources.text || '%'
UNION
SELECT statuses.*
FROM statuses, filtered_keywords
WHERE statuses.text LIKE '%' || filtered_keywords.text || '%';';

outputs:

_id  text             source
---  ---------------  ------
2    foofoobar              
3    foofoobarbar           

UPDATE:

I updated the SELECT statement as the OP points out that the previous version didn’t work when one of the two filtered_* tables is empty.