Ok, wonderful, now it is working correctly but how do I select multiple
columns from table movies?
Should I add another sub query?
Example:
SELECT genres.genres,
(
SELECT substr(group_concat(name,' '),1,60)
FROM
(
SELECT name
FROM movies
JOIN genres AS movie_genres
ON movies.movies = movie_genres.movies
WHERE movie_genres.genres = genres.genres
ORDER BY movies.name
LIMIT 6
)
),
(
SELECT substr(group_concat(movies,' '),1,60)
FROM
(
SELECT name
FROM movies
JOIN genres AS movie_genres
ON movies.movies = movie_genres.movies
WHERE movie_genres.genres = genres.genres
ORDER BY movies.name
LIMIT 6
)
)
FROM genres
GROUP BY genres
ORDER BY genres.genres;
If I add another sub query it takes almost twice the time than using only
one sub query. It is still faster than before.
Petite Abeille-2 wrote
> Yeah… the inner join vs out join will produce a significantly different
> access plan.
Yes but if that's the case don't you think that the difference in time is a
bit much?
And why there is almost no difference between JOIN and LEFT JOIN when using
tasks and people which are larger tables?
--
View this message in context:
http://sqlite.1065341.n5.nabble.com/Please-help-me-optimize-this-LEFT-JOIN-query-tp71000p71038.html
Sent from the SQLite mailing list archive at Nabble.com.
_______________________________________________
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
