I am trying to create a view in MySQL, however, an error occured:
Duplicate column name 'profil_id'
This is my request:
CREATE VIEW my_view
AS SELECT * FROM `profils` AS `p`
INNER JOIN `table_A` ON table_A.profil_id = p.id
INNER JOIN `table_B` ON table_B.profil_id = p.id
WHERE p.id = '1';
I know this is because I have to create an alias for profil_id, but I don't know how to figure out that with an INNER JOIN...
INNER JOIN `table_A` ON table_A.profil_id = p.id AS table_A_profil_id
Does not work.
Thank you for your help.
You can use the following:
CREATE VIEW my_view AS
SELECT `p`.*, `table_A`.`profil_id` AS table_A_profil_id, `table_B`.`profil_id` AS table_B_profil_id
FROM `profils` AS `p`
INNER JOIN `table_A` ON table_A.profil_id = p.id
INNER JOIN `table_B` ON table_B.profil_id = p.id
WHERE p.id = '1';
You can't use * in this case because you INNER JOIN two tables with the same column name. You need to list the columns for these two tables and set an alias to the duplicate column names.
Related
How do I rename an output of a query?
I have this query:
select *
from (generalprofile left join applicant on applicant.profileID =
generalprofile.profileID) as A
inner join (generalprofile left join applicant on applicant.profileID =
generalprofile.profileID) as B on A.applicationID = B.applicationID ;
and I need to inner join the results of 2 queries.
"AS" doesnt seem to work
You don't build the select tables in right way
inside the ( ) you must place a valid select .. not only the table name and join
select *
from ( select * form generalprofile
left join applicant on applicant.profileID =
generalprofile.profileID) A
inner join (select * from generalprofile
left join applicant on applicant.profileID =
generalprofile.profileID) B on A.applicationID = B.applicationID ;
I just used this code, and working properly with me:
SELECT
* FROM `order` as o
LEFT JOIN `services` as s ON s.`id` = o.`service_id`
LEFT JOIN `users` as u ON u.`id` = o.`users_id`
LEFT JOIN `files` as f ON f.`order_id` = o.`id`
but when I try to choose some fields from the 1st table, the results not showing the other tables
SELECT
o.`id` AS `id`,
o.`service_id`,
o.`extras`,
o.`quantity`,
o.`price`,
o.`links`,
o.`keywords`,
o.`status_id`,
o.`users_id`,
o.`date`,
o.`notes`,
o.`c_reason`,
o.`agent_star`
FROM `order` as o
LEFT JOIN `services` as s ON s.`id` = o.`service_id`
LEFT JOIN `users` as u ON u.`id` = o.`users_id`
LEFT JOIN `files` as f ON f.`order_id` = o.`id`
I don't know what is the exact error on the 2nd code, I need to show all columns from the tables: services, users & files
all columns or just defined columns
You when you select * from a join you are selecting all results from all tables involved.
When you are specifying orders you are only getting the results as they pertain to the orders table you get the same thing if you were to do SELECT o.* so if you want to see shared fields from different tables you have to specify them in your select statement as well.
Basically you're seeing the Different between SELECT * and SELECT o.*
This code is working for me, thanks everybody :)
SELECT
o.`id` AS `id`,
o.`service_id`,
o.`extras`,
o.`quantity`,
o.`price`,
o.`links`,
o.`keywords`,
o.`status_id`,
o.`users_id`,
o.`date`,
o.`notes`,
o.`c_reason`,
o.`agent_star`
s.*
u.*
f.*
FROM `order` as o
LEFT JOIN `services` as s ON s.`id` = o.`service_id`
LEFT JOIN `users` as u ON u.`id` = o.`users_id`
LEFT JOIN `files` as f ON f.`order_id` = o.`id`
In my other question I asked how to select a column from multiple tables with inner joins. My new question is: how to delete these results?
SELECT
product_image.image
FROM product
INNER JOIN ixml_prd_map ON product.sku = ixml_prd_map.id_oc_prd
INNER JOIN product_image ON product_image.product_id = product.product_id
WHERE product.model = "xy-type"
If you want to delete only from products then the below should do the job
delete p from product p
INNER JOIN ixml_prd_map ipm ON p.sku = ipm.id_oc_prd
INNER JOIN product_image pi ON pi.product_id = p.product_id
WHERE p.model = "xy-type"
But if you need to delete from all the tables matching the joining condition then use
delete p,ipm,pi from product p
INNER JOIN ixml_prd_map ipm ON p.sku = ipm.id_oc_prd
INNER JOIN product_image pi ON pi.product_id = p.product_id
WHERE p.model = "xy-type"
You can use this query
DELETE FROM product_image WHERE product_image_id IN (SELECT
product_image.image
FROM product
INNER JOIN ixml_prd_map ON product.sku = ixml_prd_map.id_oc_prd
INNER JOIN product_image ON product_image.product_id = product.product_id
WHERE product.model = "xy-type")
EDIT : From the manual
Currently, you cannot delete from a table and select from the same
table in a subquery.
If you want to modify the same query you can execute it by creating a temporary table (here its resultset)
DELETE FROM product_image WHERE product_image_id IN ( SELECT resultset.product_image_id FROM (SELECT
product_image.product_image_id
FROM product
INNER JOIN ixml_prd_map ON product.sku = ixml_prd_map.id_oc_prd
INNER JOIN product_image ON product_image.product_id = product.product_id
WHERE product.model = "xy-type") AS resultset )
OR you can use the USING like this in the example from the MySQL Manual,
13.2.2 DELETE Syntax. I haven't used the USING, but you can definetely check out.
DELETE FROM t1, t2 USING t1
INNER JOIN t2
INNER JOIN t3
WHERE t1.id=t2.id AND t2.id=t3.id;
Also this SO post will help too MySQL Error 1093 - Can't specify target table for update in FROM clause
I cannot solve this issue, I have tree tables, inner join and I'm after selecting only specific columns because I'm concerned about performance issue if I just leave SELECT * to do the job.
I have tables: ugovori-artikli, ugovori and ids, working SELECT * query:
SELECT * FROM `ugovori-artikli`
INNER JOIN `ugovori`
ON `ugovori-artikli`.`ugovor_id` = `ugovori`.`id`
INNER JOIN `ids`
ON `ugovori`.`kupac_id` = `ids`.`id`
AND `ugovori-artikli`.`artikal` = ?
and non-working query, my attempt:
SELECT a.*,
b.*,
c.id, c.ime, c.prezime
FROM `ugovori-artikli` AS a
INNER JOIN `ugovori` AS b
ON `ugovori-artikli`.`ugovor_id` = `ugovori`.`id`
INNER JOIN `ids` AS c
ON `ugovori`.`kupac_id` = `ids`.`id`
AND `ugovori-artikli`.`artikal` = ?
I get an error:
Error in query (1054): Unknown column 'ugovori-artikli.ugovor_id' in 'on clause'
Use the alias name
SELECT a.*,
b.*,
c.id, c.ime, c.prezime
FROM `ugovori-artikli` AS a
INNER JOIN `ugovori` AS b
ON a.`ugovor_id` = b.`id`
INNER JOIN `ids` AS c
ON b.`kupac_id` = c.`id`
AND a.`artikal` = ?
Hope this helps :)
You have to use the aliasses not the table name in your SQL statement.
SELECT a.*,b.*,c.id, c.ime, c.prezime
FROM `ugovori-artikli` AS a
INNER JOIN `ugovori` AS b ON a.`ugovor_id` = b.`id`
INNER JOIN `ids` AS c
ON b.`kupac_id` = cid`
AND a.`artikal` = ?
I am getting the following error:
1052 - Column 'product_id' in field list is ambiguous
When I run the following:
SELECT `product_id`, `product_name`
FROM `products`
INNER JOIN `products_has_product_category`
ON `products.product_id` = `products_has_product_category.product_id`
AND `products_has_product_category.category_id` = 1
ORDER BY `products.product_name`
My PRODUCTS table has
product_id, product_name, etc
My products_has_product_category table has
product_id, category_id
This is my first try at a join, so I appreciate the help!
You need to specify which table the product_id comes from. Since the product_id is in both tables, when you SELECT it you need to specify which table you want the value from. With a table alias:
SELECT p.product_id, p.product_name
FROM `products` p
INNER JOIN `products_has_product_category` pc
ON p.product_id = pc.product_id
AND pc.category_id = 1
ORDER BY p.product_name
Without table aliases:
SELECT `products`.`product_id`, `products`.`product_name`
FROM `products`
INNER JOIN `products_has_product_category`
ON `products.product_id` = `products_has_product_category.product_id`
AND `products_has_product_category.category_id` = 1
ORDER BY `products.product_name`
If I understand your intention correctly, you probably meant WHERE rather than AND:
SELECT `products`.`product_id`, `products`.`product_name`
FROM `products`
INNER JOIN `products_has_product_category`
ON `products.product_id` = `products_has_product_category.product_id`
WHERE `products_has_product_category.category_id` = 1
ORDER BY `products.product_name`