i have three tables. like this
mysql> desc users;
+----------------+------------------+------+-----+---------------------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+------------------+------+-----+---------------------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| email | varchar(100) | NO | UNI | NULL | |
| password | varchar(64) | NO | | NULL | |
| remember_token | varchar(100) | YES | | NULL | |
| created_at | timestamp | NO | | 0000-00-00 00:00:00 | |
| updated_at | timestamp | NO | | 0000-00-00 00:00:00 | |
+----------------+------------------+------+-----+---------------------+----------------+
6 rows in set (0.00 sec)
mysql> desc languages;
+-------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| code | varchar(2) | NO | MUL | NULL | |
| name | varchar(100) | NO | | NULL | |
| native_name | varchar(100) | NO | | NULL | |
+-------------+------------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)
mysql> desc user_know_languages;
+---------------+------------------+------+-----+---------------------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+------------------+------+-----+---------------------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| user_id | int(10) unsigned | NO | MUL | NULL | |
| language_code | varchar(2) | NO | MUL | NULL | |
| read_id | int(10) unsigned | NO | | 1 | |
| write_id | int(10) unsigned | NO | | 1 | |
| speak_id | int(10) unsigned | NO | | 1 | |
| created_at | timestamp | NO | | 0000-00-00 00:00:00 | |
| updated_at | timestamp | NO | | 0000-00-00 00:00:00 | |
+---------------+------------------+------+-----+---------------------+----------------+
8 rows in set (0.00 sec)
my User model like this
class User{
public function knowLanguages()
{
return $this->belongsToMany('Language', 'user_know_languages', 'user_id', 'language_code');
}
}
that is generated like this sql
select `languages`.*, `user_know_languages`.`user_id` as `pivot_user_id`, `user_know_languages`.`language_code` as `pivot_language_code` from `languages` inner join `user_know_languages` on `languages`.`id` = `user_know_languages`.`language_code` where `user_know_languages`.`user_id` = ?
i want .... on languages.code = user_know_languages.language_code ... instead of languages.id = user_know_languages.language_code
Any idea ?
Define primary key like this:
// Language model
protected $primaryKey = 'code';
Related
This question already has answers here:
ERROR 1054 (42S22): Unknown column '' in 'field list'
(2 answers)
Closed 3 years ago.
mysql> desc apn_licence;
+------------+------------------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+------------------+------+-----+-------------------+-------+
| vdomain | char(32) | NO | PRI | test | |
| vhost | char(32) | NO | PRI | | |
| licence | char(64) | NO | | | |
| tcpport | int(11) | NO | | 0 | |
| srvtype | tinyint(4) | NO | | 0 | |
| auxcmd | tinyint(3) | YES | | 0 | |
| agentuid | int(10) unsigned | NO | | 1 | |
| owneruid | int(10) unsigned | NO | | 1 | |
| sno | char(32) | YES | | 0 | |
| pno | char(32) | YES | | 0 | |
| updatedate | timestamp | NO | | CURRENT_TIMESTAMP | |
| builddate | timestamp | NO | | CURRENT_TIMESTAMP | |
+------------+------------------+------+-----+-------------------+-------+
12 rows in set (0.00 sec)
mysql> desc apn_agent;
+--------------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+----------------+
| uid | int(10) unsigned | NO | PRI | NULL | auto_increment |
| euid | int(10) unsigned | YES | | 0 | |
| username | char(16) | NO | UNI | | |
| password | char(16) | YES | | NULL | |
| priv_licence | tinyint(3) unsigned | NO | | 0 | |
| priv_admin | tinyint(3) unsigned | NO | | 0 | |
| priv_srv | tinyint(3) unsigned | NO | | 0 | |
| plant_asign | int(11) | YES | | 0 | |
+--------------+---------------------+------+-----+---------+----------------+
8 rows in set (0.00 sec)
mysql> desc apn_routine;
+------------+----------------------+------+-----+-------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+----------------------+------+-----+-------------------+-------+
| acxid | int(10) unsigned | NO | PRI | 0 | |
| sid | int(10) unsigned | NO | PRI | 0 | |
| wanipaddr | int(10) unsigned | YES | | 0 | |
| udpport | smallint(5) unsigned | NO | | 8400 | |
| serial | bigint(20) unsigned | YES | | 0 | |
| nserial | bigint(20) unsigned | YES | | 0 | |
| rivec | char(32) | YES | | NULL | |
| stat | smallint(5) unsigned | YES | | 4 | |
| vtype | smallint(5) unsigned | YES | | 0 | |
| gwtype | smallint(5) unsigned | YES | | 2 | |
| vactlevel | int(10) unsigned | YES | | 0 | |
| vnatlevel | int(10) unsigned | YES | | 0 | |
| vdomain | char(32) | NO | | | |
| vhost | char(32) | NO | | | |
| vsubkey | char(32) | YES | | public | |
| passwd | char(64) | YES | | NULL | |
| gwmac | char(18) | YES | MUL | 00:0D:B0:00:00:00 | |
| vsubnet | int(10) unsigned | YES | | 0 | |
| vsubmask | int(10) unsigned | YES | | 0 | |
| vgwip | int(10) unsigned | YES | | 0 | |
| vgwnexthop | int(10) unsigned | YES | | 0 | |
| groupstamp | timestamp | NO | | CURRENT_TIMESTAMP | |
| joinstamp | timestamp | NO | | CURRENT_TIMESTAMP | |
+------------+----------------------+------+-----+-------------------+-------+
23 rows in set (0.00 sec)
With mysql-3.23.58
select l.*, a.username from apn_licence as l, apn_agent as a
left join apn_routine as r on l.vdomain=r.vdomain and l.vhost=r.vhost
where
l.agentuid=a.uid
group by l.vdomain
order by l.tcpport DESC,l.vdomain,l.vhost;
is OK.
But with mysql-5.7.26,it get the error as:
ERROR 1054 (42S22): Unknown column 'l.vdomain' in 'on clause'
Looks like there are invisible garbage characters in your query.
Try retyping the query (don't copy and paste or you'll most likely include the garbage character) and most probably it should work.
Thanks all,I found the answer in
[MySQL unknown column in ON clause
The correct query is
select l.*, a.username from (apn_licence as l, apn_agent as a)
left join apn_routine as r on l.vdomain=r.vdomain and l.vhost=r.vhost
where
l.agentuid=a.uid
group by l.vdomain
order by l.tcpport DESC,l.vdomain,l.vhost;
select alias from icinga_hosts; prints all the host names in every hostgroup.
select alias from icinga_hostgroups; prints all the hostgroups.
I can't see how to "select select alias from icinga_hosts where icinga_hostgroups is "customer0";
In other words, 'print all the hostnames in hostgroup customer0'.
Do I need a join of some sort? This is MariaDB 5.5. Thanks for any advice.
MariaDB [icinga]> show fields in icinga_hostgroups;
+---------------------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------------+---------------------+------+-----+---------+----------------+
| hostgroup_id | bigint(20) unsigned | NO | PRI | NULL | auto_increment |
| instance_id | bigint(20) unsigned | YES | MUL | 0 | |
| config_type | smallint(6) | YES | | 0 | |
| hostgroup_object_id | bigint(20) unsigned | YES | | 0 | |
| alias | varchar(255) | YES | | | |
| notes | text | YES | | NULL | |
| notes_url | text | YES | | NULL | |
| action_url | text | YES | | NULL | |
| config_hash | varchar(64) | YES | | NULL | |
+---------------------+---------------------+------+-----+---------+----------------+
9 rows in set (0.00 sec)
show fields in icinga_hosts;
+-----------------------------------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------------------+---------------------+------+-----+---------+----------------+
| host_id | bigint(20) unsigned | NO | PRI | NULL | auto_increment |
| instance_id | bigint(20) unsigned | YES | MUL | 0 | |
| config_type | smallint(6) | YES | | 0 | |
| host_object_id | bigint(20) unsigned | YES | MUL | 0 | |
| alias | varchar(255) | YES | | | |
| display_name | varchar(255) | YES | | | |
| address | varchar(128) | YES | | | |
select oh.name1 as host_name, ohg.name1 as hostgroup_name
from icinga_hosts h
join icinga_objects oh on h.host_object_id=oh.object_id
join icinga_hostgroup_members hgm on hgm.host_object_id=h.host_object_id
join icinga_hostgroups hg on hg.hostgroup_id=hgm.hostgroup_id
join icinga_objects ohg on hg.hostgroup_object_id=ohg.object_id
where ohg.name1='linux-servers';
You need the icinga_hostgroup_members table like:
SELECT groups.alias AS 'Group',
hosts.alias AS Host
FROM icinga_hosts AS hosts
JOIN icinga_hostgroup_members AS group_members
ON hosts.host_object_id = group_members.host_object_id
JOIN icinga_hostgroups AS groups
ON group_members.hostgroup_id = groups.hostgroup_id
WHERE groups.alias = 'customer0';
Two table are populated from a CSV file :
routers:
+------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| type_id | int(11) | YES | MUL | NULL | |
| identificationID | varchar(255) | NO | | NULL | |
| wep | varchar(255) | NO | | NULL | |
| ssid | varchar(255) | NO | UNI | NULL | |
+------------------+--------------+------+-----+---------+----------------+
and
pickups:
+--------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| type_id | int(11) | YES | MUL | NULL | |
| enable | tinyint(1) | YES | | NULL | |
| name | varchar(255) | NO | | NULL | |
| adress | varchar(255) | YES | | NULL | |
| zip | varchar(255) | YES | | NULL | |
| city | varchar(255) | YES | | NULL | |
| googleGeoCode | varchar(255) | YES | | NULL | |
| agent | tinyint(1) | YES | | NULL | |
| userRestricted | tinyint(1) | YES | | NULL | |
| superUserPickup_id | int(11) | YES | UNI | NULL | |
| telephone | varchar(255) | YES | | NULL | |
+--------------------+--------------+------+-----+---------+----------------+
Because everything comes from Excel, I need a SQL code to populate a third table which is
pickup_has_router :
+-----------+----------+------+-----+-------------------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+----------+------+-----+-------------------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| router_id | int(11) | YES | MUL | NULL | |
| pickup_id | int(11) | YES | MUL | NULL | |
| timeStamp | datetime | NO | | CURRENT_TIMESTAMP | |
+-----------+----------+------+-----+-------------------+----------------+
For example, I know that below routers have the pickup ID n°1, and I know how to fetch them
SELECT * FROM `routers` WHERE `identificationID` IN(
'UCDDU17805001464',
'UCDDU17805001029',
'UCDDU17805000137',
'UCDDU17805000129',
'UCDDU17805001394'
)
But from the result of above statment, how to loop the INSERT statment which would be something like:
INSERT INTO `pickup_has_router` (`id`, `router_id`, `pickup_id`, `timeStamp`)
WHERE `identificationID` IN(
'UCDDU17805001464',
'UCDDU17805001029',
'UCDDU17805000137',
'UCDDU17805000129',
'UCDDU17805001394'
)
VALUES (NULL, 'router.id', '1', CURRENT_TIMESTAMP);
Thanks for the help.. I have been searching quite a lot and yes SQL is not my best skill :-))))))
insert into `pickup_has_router` (`router_id`, `pickup_id`)
select `id`, 1 from `routers`
where `identificationID` in(
'UCDDU17805001464',
'UCDDU17805001029',
'UCDDU17805000137',
'UCDDU17805000129',
'UCDDU17805001394'
)
When doing an insert, instead of the values clause you can use a select statement, where the columns returned by the select statement match the columns required by the insert.
I have the following SQL generated from my Rails app, it is trying to get a list of all auto models that have live adverts in a marketplace app & from mysql:
SELECT `models`.* FROM `models`
INNER JOIN `autos` ON autos.model_id = models.id
INNER JOIN `ads` ON `ads`.id = `autos`.ad_id
WHERE (ads.ad_status_id = 4 AND pub_start_date < NOW() AND pub_end_date > NOW() AND models.manufacturer_id = 50 )
GROUP BY models.id ORDER BY models.name;
When I run an explain, this is what I get:
Id 1 1 1
Select Type SIMPLE SIMPLE SIMPLE
Table models autos ads
Type ref ref eq_ref
Possible Keys PRIMARY,manufacturer_id model_id,ad_id PRIMARY,quick_search,ad_status_id
Key manufacturer_id model_id PRIMARY
Key Length 5 4 4
Ref const concept_development.models.id concept_development.autos.ad_id
Rows 70 205 1
Extra Using where; Using temporary; Using filesort Using where Using where
I cannot understand why the query is generating a temporary table / using file-sort - all of the referenced keys are indexes. Been trying to figure this out for a few days now and getting nowhere.
Any help is very much appreciated!
EXPLAIN models:
+---------------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | varchar(32) | YES | | NULL | |
| manufacturer_id | int(11) | YES | MUL | NULL | |
| vehicle_category_id | int(11) | NO | MUL | 1 | |
| synonym_names | longtext | YES | | NULL | |
+---------------------+-------------+------+-----+---------+----------------+
SHOW INDEXES FROM models:
+--------+------------+---------------------+--------------+---------------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+--------+------------+---------------------+--------------+---------------------+-----------+-------------+----------+--------+------+------------+---------+
| models | 0 | PRIMARY | 1 | id | A | 2261 | NULL | NULL | | BTREE | |
| models | 1 | manufacturer_id | 1 | manufacturer_id | A | 205 | NULL | NULL | YES | BTREE | |
| models | 1 | vehicle_category_id | 1 | vehicle_category_id | A | 7 | NULL | NULL | | BTREE | |
+--------+------------+---------------------+--------------+---------------------+-----------+-------------+----------+--------+------+------------+---------+
MODEL TABLE STATUS:
+--------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+--------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
| models | MyISAM | 10 | Dynamic | 2261 | 26 | 61000 | 281474976710655 | 84992 | 0 | 2751 | 2010-09-28 18:42:45 | 2010-09-28 18:42:45 | 2010-09-28 18:44:00 | latin1_swedish_ci | NULL | | |
+--------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
EXPLAIN ADS
+------------------+--------------------------+------+-----+---------------------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------------+--------------------------+------+-----+---------------------+----------------+
| id | int(10) | NO | PRI | NULL | auto_increment |
| fp_urn | int(10) | NO | MUL | 0 | |
| user_id | int(10) | NO | MUL | 0 | |
| ad_status_id | int(3) unsigned | NO | MUL | 1 | |
| style_id | int(10) | NO | | 3 | |
| search_tags | varchar(255) | YES | | NULL | |
| title | varchar(255) | NO | | | |
| description | text | YES | | NULL | |
| currency | enum('EUR','GBP') | NO | | EUR | |
| price | decimal(8,2) | NO | MUL | 0.00 | |
| proposal_type | enum('Offered','Wanted') | NO | | Offered | |
| category_id | int(10) | YES | | 0 | |
| contact | varchar(50) | NO | MUL | | |
| area_id | int(10) | NO | | 0 | |
| origin_id | int(10) | NO | | 0 | |
| reject_reason_id | int(3) | NO | | 0 | |
| date_created | timestamp | NO | | 0000-00-00 00:00:00 | |
| last_modified | timestamp | NO | | CURRENT_TIMESTAMP | |
| pub_start_date | datetime | YES | | 0000-00-00 00:00:00 | |
| pub_end_date | datetime | YES | | 0000-00-00 00:00:00 | |
| bumped_up_date | datetime | YES | | 0000-00-00 00:00:00 | |
| state | smallint(6) | YES | | NULL | |
| eproofed | tinyint(1) | NO | | 0 | |
| is_featured | int(1) | NO | | 0 | |
| num_featured_imp | int(10) | YES | | 0 | |
| num_direct_imp | int(10) | YES | | 0 | |
| is_top_listed | int(1) | NO | | 0 | |
| delta | tinyint(1) | NO | | 0 | |
| ext_ref_id | varchar(50) | YES | | NULL | |
| email_seller | tinyint(1) | YES | | 1 | |
| sort_by | int(10) | YES | | 8 | |
| permalink | varchar(500) | YES | | NULL | |
| external_url | varchar(255) | YES | | NULL | |
+------------------+--------------------------+------+-----+---------------------+----------------+
SHOW TABLE STATUS FROM concept_development WHERE NAME LIKE 'ads';
+------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+-------------------------------------------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+-------------------------------------------------+---------+
| ads | InnoDB | 10 | Compact | 656350 | 232 | 152748032 | 0 | 87736320 | 340787200 | 1148382 | 2010-09-29 09:55:46 | NULL | NULL | utf8_general_ci | NULL | checksum=1 delay_key_write=1 row_format=DYNAMIC | |
+------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+-------------------------------------------------+---------+
SHOW INDEXES FROM ADS
+-------+------------+-----------+--------------+--------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+-------+------------+-----------+--------------+--------------+-----------+-------------+----------+--------+------+------------+---------+
| ads | 0 | PRIMARY | 1 | id | A | 521391 | NULL | NULL | | BTREE | |
| ads | 1 | NewIndex1 | 1 | ad_status_id | A | 15 | NULL | NULL | | BTREE | |
| ads | 1 | NewIndex1 | 2 | pub_end_date | A | 260695 | NULL | NULL | YES | BTREE | |
| ads | 1 | NewIndex1 | 3 | category_id | A | 521391 | NULL | NULL | YES | BTREE | |
| ads | 1 | NewIndex1 | 4 | style_id | A | 521391 | NULL | NULL | | BTREE | |
| ads | 1 | NewIndex2 | 1 | user_id | A | 130347 | NULL | NULL | | BTREE | |
| ads | 1 | NewIndex3 | 1 | price | A | 7667 | NULL | NULL | | BTREE | |
| ads | 1 | contact | 1 | contact | A | 260695 | NULL | NULL | | BTREE | |
| ads | 1 | fp_urn | 1 | fp_urn | A | 521391 | NULL | NULL | | BTREE | |
+-------+------------+-----------+--------------+--------------+-----------+-------------+----------+--------+------+------------+---------+
EXPLAIN autos
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+-------------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+-------------+----------------+
| id | int(10) | NO | PRI | NULL | auto_increment |
| ad_id | int(10) | YES | MUL | NULL | |
| style_id | int(10) | YES | MUL | NULL | |
| manufacturer_id | int(10) | NO | MUL | NULL | |
| model_id | int(10) | NO | MUL | NULL | |
| registration | varchar(10) | YES | | NULL | |
| year | int(4) | YES | | NULL | |
| fuel_type | enum('Petrol','Diesel') | NO | | Petrol | |
| colour | varchar(75) | YES | | NULL | |
| mileage | varchar(25) | NO | | Not Entered | |
| mileage_units | enum('mls','kms') | NO | | mls | |
| num_doors | varchar(25) | NO | | Not Entered | |
| num_owners | int(2) | YES | | NULL | |
| engine_size | varchar(10) | YES | | NULL | |
| transmission_type | enum('Manual','Automatic') | NO | | Manual | |
| body_type | enum('Saloon','Hatchback') | NO | | Saloon | |
| condition | varchar(75) | NO | | NA | |
| extra_features | text | YES | | NULL | |
| tax_expiry | varchar(7) | YES | | NULL | |
| nct_expiry | varchar(7) | YES | | NULL | |
| variation | text | YES | | NULL | |
| tax_class | enum('Agricultural','Bus') | NO | | Private | |
| co2 | int(9) | YES | | NULL | |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+-------------+----------------+
SHOW TABLE STATUS FROM concept_development WHERE NAME LIKE 'autos'
+-------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+-------------------------------------------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+-------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+-------------------------------------------------+---------+
| autos | InnoDB | 10 | Compact | 196168 | 136 | 26804224 | 0 | 26279936 | 340787200 | 485405 | 2010-09-17 22:09:45 | NULL | NULL | utf8_general_ci | NULL | checksum=1 delay_key_write=1 row_format=DYNAMIC | |
+-------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+-------------------------------------------------+---------+
show indexes from autos;
+-------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+-------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+
| autos | 0 | PRIMARY | 1 | id | A | 294937 | NULL | NULL | | BTREE | |
| autos | 1 | ad_id | 1 | ad_id | A | 294937 | NULL | NULL | YES | BTREE | |
| autos | 1 | style_id | 1 | style_id | A | 10 | NULL | NULL | YES | BTREE | |
| autos | 1 | manufacturer_id | 1 | manufacturer_id | A | 194 | NULL | NULL | | BTREE | |
| autos | 1 | model_id | 1 | model_id | A | 830 | NULL | NULL | | BTREE | |
+-------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+
From the MySQL documentation:
Temporary tables can be created under conditions such as these:
* If there is an ORDER BY clause and a different GROUP BY clause, or if the ORDER BY or GROUP BY contains columns from tables other than the first table in the join queue, a temporary table is created.
http://dev.mysql.com/doc/refman/5.1/en/internal-temporary-tables.html
Change all the text columns to varchar. If you need to maintain them as "text", you'll need to snowflake the schema and exclude the description tables from this query.
If any of the columns in any of the tables are text or blob, MySQL automatically creates an on-disk temporary table, rather than an in-memory temporary table. The temporary table itself isn't killing you, it's the fact that it's writing it to the disk.
http://dev.mysql.com/doc/refman/5.1/en/internal-temporary-tables.html
Some conditions prevent the use of an in-memory temporary table, in which case the server uses an on-disk table instead:
Presence of a BLOB or TEXT column in the table
You have a index on pub_end_date, but not on pub_start_date and your WHERE clause references both.
It looks like it is not using the pub_end_date index, but this could be because it needs to check pub_start_date as well.
This isn't explaining why but how about you rewrite your query to not use a group by? I think you're just joining on those tables to ensure there exists an ad of interest. So how about:
SELECT `models`.*
FROM `models`
WHERE models.manufacturer_id = 50
AND EXISTS ( SELECT * FROM `autos`
INNER JOIN `ads` ON `ads`.id = `autos`.ad_id
WHERE autos.model_id = models.id
AND ads.ad_status_id = 4
AND ads.pub_start_date < NOW()
AND ads.pub_end_date > NOW()
)
ORDER BY models.name;
The performance issues might be related to the group by, in which case this would improve performance.
Maybe it'd look a bit nicer with and NOW() between ads.pub_start_date and ads.pub_end_date, if you're allowed to do that in mysql (and if it works how you want with the edge cases).
query:
SELECT u.deviceID, u.userName, u.contactNo, u.rating
FROM User u
INNER JOIN TaxiQuery t ON u.deviceID = t.seat1
OR u.deviceID = t.seat2
OR u.deviceID = t.seat3
OR u.deviceID = t.seat4
WHERE t.queryID = 3;
+--------------------------------------+----------+-----------+--------+
| deviceID | userName | contactNo | rating |
+--------------------------------------+----------+-----------+--------+
| 00000000-0000-1000-8000-0016CB8B3C8E | uuuuuu | 55555 | 5 |
+--------------------------------------+----------+-----------+--------+
describe user;
+-----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+-------+
| deviceID | varchar(100) | NO | PRI | NULL | |
| userName | varchar(100) | YES | | NULL | |
| contactNo | int(11) | YES | | NULL | |
| emailAddr | varchar(100) | YES | | NULL | |
| rating | int(11) | YES | | NULL | |
+-----------+--------------+------+-----+---------+-------+
mysql> describe taxiQuery;
+--------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+----------------+
| queryID | int(11) | NO | PRI | NULL | auto_increment |
| destination | varchar(100) | YES | | NULL | |
| deptTime | varchar(100) | YES | | NULL | |
| startingPt | varchar(100) | YES | | NULL | |
| boardingPass | varchar(100) | YES | | NULL | |
| miscInfo | varchar(100) | YES | | NULL | |
| seat1 | varchar(100) | YES | | NULL | |
| seat2 | varchar(100) | YES | | NULL | |
| seat3 | varchar(100) | YES | | NULL | |
| seat4 | varchar(100) | YES | | NULL | |
+--------------+--------------+------+-----+---------+----------------+
What i want is to display the user's information if they exist in (seat1/seat2/seat3/seat4) in TaxiQuery. But i am only able to output one result when they are suppose to be three.
May i know how do i modify mysql statement to display the user's information when (seat1-4 is the foreign key to the deviceID of User's table) when seat1, seat2, seat3, seat4 contains the deviceID of the users?
As far as I can tell, it should work if you don't do an INNER join. I think the INNER keyword is telling mySQL to only include each source a maximum of once, so it will only use one copy of the TaxiQuery, when you actually need up to four (one per seat).