mysql not in statement

Hi,

I have these two tables:
CREATE TABLE conditions_actives_score(
  cas_id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  user_id INT(11) UNSIGNED DEFAULT NULL,
  condition_id INT(11) UNSIGNED DEFAULT NULL,
  active_id INT(11) UNSIGNED DEFAULT NULL,
  safe SMALLINT(6) DEFAULT NULL,
  effectiveness SMALLINT(6) UNSIGNED DEFAULT NULL,
  PRIMARY KEY (cas_id)
)

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CREATE TABLE actives(
  active_id INT(11) NOT NULL AUTO_INCREMENT,
  active_name VARCHAR(100) NOT NULL,
  PRIMARY KEY (active_id)
)

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I want to find all the active_name(s) from table actives where actives.active_id IS NOT FOUND IN conditions_actives_score.active_id.

I tried this:
select actives.* from actives where conditions_actives_score.active_id not in actives.active_id

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but it gives me an error.
Victor KimuraSEO, Web DeveloperAsked:
Who is Participating?
 
enachemcConnect With a Mentor Commented:
select actives.* from actives left join conditions_actives_score on conditions_actives_score.active_id = actives.active_id
where conditions_actives_score.active_id is null
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mostartCommented:
select actives.* from actives where active_id not in (select active_id from conditions_actives_score)
0
 
LowfatspreadConnect With a Mentor Commented:
use not exists

select *
from actives as a
where not exists (select active_id from conditions_actives as x
where x.active_id = a.active_id)
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enachemcCommented:
while the above are correct, they would work slowly if the second table is large
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mostartConnect With a Mentor Commented:
can't really confirm this:

mysql> select SQL_NO_CACHE actives.* from actives left join conditions_actives_score on conditions_actives_score.active_id = actives.active_id where conditions_actives_score.active_id is null;
+-----------+---------------+
| active_id | active_name   |
+-----------+---------------+
|     49999 | 'myName49999' |
+-----------+---------------+
1 row in set (0.97 sec)

mysql> select SQL_NO_CACHE actives.* from actives where active_id not in (select active_id from conditions_actives_score);
+-----------+---------------+
| active_id | active_name   |
+-----------+---------------+
|     49999 | 'myName49999' |
+-----------+---------------+
1 row in set (0.15 sec)


I ran the two versions several times an always had the second one around 4 times faster..



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mostartCommented:
ah sorry forgot to add:

table actives contained 5 and the second table contained 350.000 rows
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Victor KimuraSEO, Web DeveloperAuthor Commented:
Hi mostart,

This works for me:
select SQL_NO_CACHE actives.* from actives left join conditions_actives_score on conditions_actives_score.active_id = actives.active_id where conditions_actives_score.active_id is null;

But for some reason nothing is returned on this second sql:
select SQL_NO_CACHE actives.* from actives where active_id not in (select active_id from conditions_actives_score);

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mostartCommented:
For me both are returning the same result as already shown above.
Could you post the corresponding lines from your mysql console containing query and results ?
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Victor KimuraSEO, Web DeveloperAuthor Commented:
Hi mostart:

No errors. Just blank. I see the active_id, active_name columns.

CREATE TABLE skinca_dermapproved.conditions_actives_score(
  cas_id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  user_id INT(11) UNSIGNED DEFAULT NULL,
  condition_id INT(11) UNSIGNED DEFAULT NULL,
  active_id INT(11) UNSIGNED DEFAULT NULL,
  safe SMALLINT(6) DEFAULT NULL,
  effectiveness SMALLINT(6) UNSIGNED DEFAULT NULL,
  PRIMARY KEY (cas_id)
)
ENGINE = MYISAM
AUTO_INCREMENT = 19
AVG_ROW_LENGTH = 21
CHARACTER SET latin1
COLLATE latin1_swedish_ci;

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INSERT INTO conditions_actives_score VALUES 
  (1, 1, 1, 5, 0, 0),
  (2, 1, 1, 8, 1, 1),
  (3, 1, 1, 6, 1, 1),
  (4, NULL, NULL, NULL, NULL, NULL),
  (5, 1, 1, 7, 0, NULL),
  (6, 1, 1, 9, 1, NULL),
  (7, 1, 2, 1, 1, NULL),
  (8, 1, 2, 2, 0, NULL),
  (9, 1, 1, 10, 1, NULL),
  (10, 1, 1, 11, 1, NULL),
  (11, 2, 1, 5, 1, NULL),
  (12, 2, 1, 6, 1, NULL),
  (13, 2, 1, 7, 0, NULL),
  (14, 2, 2, 1, 0, NULL),
  (15, 2, 2, 2, 1, NULL),
  (16, 1, 2, 3, 1, NULL),
  (17, 1, 2, 4, 1, NULL),
  (18, 1, 2, 5, 0, NULL);

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CREATE TABLE skinca_dermapproved.actives(
  active_id INT(11) NOT NULL AUTO_INCREMENT,
  active_name VARCHAR(100) NOT NULL,
  PRIMARY KEY (active_id)
)
ENGINE = MYISAM
AUTO_INCREMENT = 27
AVG_ROW_LENGTH = 26
CHARACTER SET latin1
COLLATE latin1_swedish_ci;

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INSERT INTO actives VALUES 
  (1, 'Hydroquinone'),
  (2, 'Arbutin'),
  (3, 'Vitamin C'),
  (4, 'Kojic acid'),
  (5, 'Benzoyl peroxide'),
  (6, 'Salicylic acid'),
  (7, 'Alpha-hydroxy acids'),
  (8, 'Triclosan'),
  (9, 'Sulfur'),
  (10, 'Polyhydroxy acids'),
  (11, 'Retinols'),
  (12, 'Almond'),
  (13, 'Almond (Prunus amygdalus)'),
  (14, 'Citric Acid (Alpha-Hydroxy Acid)');

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mostartConnect With a Mentor Commented:
Ok I see you have NULL values in the active_id column of the onditions_actives_score table. Thats why you don't see results.

Change the query like this:

select actives.* from actives where active_id not in (select active_id from conditions_actives_score where active_id is not null);
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Victor KimuraSEO, Web DeveloperAuthor Commented:
Thank you, mostart. =)
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Victor KimuraSEO, Web DeveloperAuthor Commented:
Thank you. =)
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