MySQL NOT IN from another column in the same table - mysql

Question

I want to run a mysql query to select all rows from a table films where the value of the title column does not exist anywhere in all the values of another column (collection).
Here is a simplified version of my table with content:
mysql> select * from films;
+----+--------------+--------------+
| id | title | collection |
+----+--------------+--------------+
| 1 | Collection 1 | NULL |
| 2 | Film 1 | NULL |
| 3 | Film 2 | Collection 1 |
+----+--------------+--------------+
Here is my query:
mysql> SELECT * FROM films WHERE title NOT IN (SELECT collection FROM films);
Empty set (0.00 sec)
In this example, I would want to select the rows with titles Film 1 and Film 2, but my query is returning no rows.
Here is the table structure:
CREATE TABLE `films` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(200) NOT NULL DEFAULT '',
`collection` varchar(200) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM;

Answer 1

SELECT *
FROM films
WHERE title NOT IN (SELECT collection FROM films where collection is not null);
SQLFiddle: http://sqlfiddle.com/#!2/76278/1

Answer 2

Have you tried using NOT EXISTS:
SELECT *
FROM films f1
WHERE NOT EXISTS (SELECT collection
FROM films f2
WHERE f1.title = f2.collection);
See SQL Fiddle with Demo
If you want to use IN then you will want to look for values that are NOT NULL:
SELECT *
FROM films
WHERE title NOT IN (SELECT collection
FROM films
WHERE collection is not null);
See SQL Fiddle with Demo
The result for both is:
| ID | TITLE | COLLECTION |
------------------------------
| 2 | Film 1 | (null) |
| 3 | Film 2 | Collection 1 |
The problem with your current query is that -- stealing from #Quassnoi's answer here:
Both IN and NOT IN return NULL which is not an acceptable condition for WHERE clause.
Since the null value is being returned by your subquery you want to specifically exclude it.

Answer 3

Another option using an outer join
SELECT f.*
FROM films f LEFT OUTER JOIN films ff
ON f.title = ff.collection
WHERE ff.collection IS NULL

Answer 4

Try this please:
SQLFIDDLE DEMO
Query:
select a.id, a.planid
from one a
left join one b
on a.planid <> b.iid
where not (b.iid is null)
group by b.id
;
Results: based on the sample table I used.
ID PLANID
t15 1
j18 2
EDIT TO ADD : HERE WITH OP SCHEMA
select b.id, b.title
from opschema b
inner join opschema a
on b.title <> a.collection
or b.collection <> a.title
group by b.id
;
OP SHCEMA SQLFIDDLE DEMO
ID TITLE
2 Film 1
3 Film 2

Answer 5

CREATE TABLE IF NOT EXISTS `reservation_tables` (
`res_table_id` int(10) NOT NULL AUTO_INCREMENT,
`res_table_name` int(10) NOT NULL,
`date_time` varchar(20) NOT NULL,
`partyhall_id` int(10) NOT NULL,
`flag` enum('0','1') NOT NULL DEFAULT '0',
PRIMARY KEY (`res_table_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=9 ;
INSERT INTO `reservation_tables` (`res_table_id`, `res_table_name`, `date_time`, `partyhall_id`, `flag`) VALUES
(1, 1, '2014-08-17 12:00 am', 7, '1'),
(2, 2, '2014-08-17 12:00 am', 7, '1'),
(3, 3, '2014-08-18 12:00 am', 8, '1'),
(4, 4, '2014-08-18 12:00 am', 8, '1'),
(5, 1, '2014-08-25 12:00 am', 12, '1'),
(6, 2, '2014-08-25 12:00 am', 12, '1'),
(7, 3, '2014-08-20 12:00 am', 23, '1'),
(8, 4, '2014-08-20 12:00 am', 23, '1');
Ι had to select available table name for matching date_time
Example select available table_name where date_time = 2014-08-18 12:00 am.
solution query is:
im sure this works well
SELECT distinct res_table_name FROM reservation_tables WHERE `res_table_name` NOT IN
(SELECT `res_table_name` FROM reservation_tables where `date_time` = '2014-08-17 12:00 am')