I have a query
SELECT jss_products.* from jss_products_tree,jss_products
WHERE stock!=0 AND
jss_products.productID = jss_products_tree.productID
and sectionID=1 order by price
Which returns me a big array with products. Now I need to join 3rd table jss_extrafields_values,
which has productID and content fields, and somehow order the array by the content from 3rd table. Also it might have more than one rows with different content but same product.ID.. any ideas on how to join all of them? I tried a lot of tutorials but none of them helped me.. thanks
Its easier to use join over from table1, table2 as its better to read. And you can just join the 3th table.
SELECT jss_products.* from jss_products_tree
INNER JOIN jss_products
ON jss_products.productID = jss_products_tree.productID
INNER JOIN jss_extrafields_values
on jss_extrafields_values.productId = jss_products.productID
WHERE stock!=0 AND
and sectionID=1
order by jss_extrafields_values.field
Related
Good Day.
I know this question is already asked but I have a hard time implementing my problem.
I want to Join 3 tables. Here is how my tables look like:
Order_Header(Order_Header_ID{PK}, Order_Date, Order_Time, Order_Complete)
Order_Line(Order_Line_ID{PK}, Product_ID{FK}, Order_Header_ID{FK},Quantity)
Products(Product_ID{PK}, Description, Cost)
I Want to JOIN the three tables so that in one table it displays Order_Header_ID, Quantity and Description out of the three tables WHERE Order_Complete = 'YES'.
I have the following SQL that displays all the information but do not join them.
SELECT
Order_Header.Order_Header_ID,
Products.Description,
Order_Line.Quantity
FROM Order_Header, Products, Order_Line
WHERE Order_Complete = 'yes'
The idea is that it list a Order_Header_ID once with the corresponding Description and Quantity only once.
Thank you in advance
Your current query is missing join conditions. Also, it is preferable to use an explicit join syntax. Correcting for both of these things we can write the following query:
SELECT
oh.Order_Header_ID,
p.Description,
ol.Quantity
FROM Order_Header oh
INNER JOIN Order_Line ol
ON oh.Order_Header_ID = ol.Order_Header_ID
INNER JOIN Products p
ON ol.Product_ID = p.Product_ID
WHERE
oh.Order_Complete = 'yes'
$sql = mysql_query("SELECT totals.*, sum(totals.payments) as total_payments
FROM totals
INNER JOIN users
GROUP BY totals.idseller;");
When i add the INNER JOIN the sum value is changed. Why?
In my SQL table i have one record in totals width this value: 8943.09 but when i do the some the result is giving me this value: 44715.45
What i am doing wrong?
$sql = mysql_query("SELECT totals.*, sum(totals.payments) as total_payments FROM totals
INNER JOIN users ON totals.idseller = users.idseller
GROUP BY users.UserName;");
Use this Hope this will help you.
When you INNER JOIN to another table, the returned data set is modified to only include rows that exist in both tables. In this case it is likely that there are rows in 'totals' that do not have a matching row in users - either the totals.idseller field might accept null values, or data has become orphaned when matching users have been deleted or edited.
If you want all data in 'totals' regardless of matching user you would user a LEFT JOIN instead in ms-sql, I suspect a similar approach will work in my-sql
You should give an "on" based on the ids. Such as like
inner join users on users.id = totals.idseller
Otherways the sql server will combine all possible rows in the tables, which is most cases not what you wish.
Because when you are adding inner join in your SQL Query, it means you are selecting the data which is common in both the tables.
EX:
SELECT * FROM TABLE_A
INNER JOIN TABLE_B
ON TABLE_A.ID = TABLE_B.ID
If you are joining users table which contains 5 records. By joining table, as there is no any column mapping, this sum-up 5 times and this is reason for showing different values.
Please let me know something wrong in it.
Thanks,
Umehs
I have three different SQL tables I need to join:
table "internet" with columns id|type|status
table "type_list" with columns id|type_name
table "status_list" with columns id|status_name
I want to output text from the two other tables (type_list, status_list) but not values as numbers which currently I have in table "internet".
I also don't want to make lazy programming - PHP array to make ID's equal to something like
$type_list = array("1"=>"VDSL2","2"=>"ADSL");
$status_list = array("1"=>"Pending","2"=>"Active");
because the text is already in the tables, i just dont know how to join them and output the text as query combined together in one query.
Use JOIN
SELECT i.id, type_name, status_name
FROM internet i
LEFT OUTER JOIN type_list t ON t.id = i.type
LEFT OUTER JOIN status_list s ON s.id= i.status
Read the MySQL doc for more informations.
Just write the select with the fields you want.
select internet.id,type_name,status_name from internet
inner join type_list
on type_list.id=internet.id
inner join status_list
on status_list.id=internet.id
For this you need a LEFT JOIN, like so:
SELECT i.id, t.type_name, s.status_name
FROM internet AS i
LEFT JOIN type_list AS t ON t.id = i.id
LEFT JOIN status_list AS s ON s.id= i.id
From your question, it is unclear what field you would like to join the queries on. In the above example, the queries are joined on the id field.
Please also note that the AS is not actually necessary, I have just put it in there to make it clear what is going on
I have two tables: 'posts' and 'users' every post has a 'ref_id' column to get the user id who posted it.
Now, I am getting posts this way:
$this->db->query("SELECT * FROM posts WHERE time > '$timeLimit' LIMIT 50");
I can't understand how to join every result to get the poster related data as well. What I am doing right now is basically a loop inside a loop, where foreach of the result, get their user info. But it is pretty obvious that this is very wrong,
Apparently I need to start using joins, but how does one do it? this should be a really simple example to work with, I suppose.
Any help? Thank you.
SELECT posts.*, users.*
FROM posts
INNER JOIN users
ON posts.posted_by = users.id;
Like this:
SELECT
posts.*,,
users.Username
FROM posts
INNER JOIN users ON posts.ref_id = users.user_id;
Explanation:
To JOIN to any tables with each others, there are two things; the JOIN type and the join condition. There are three main types of join:
INNER JOIN, only the rows that match the join condition will be returned from the two tables no more rows. But:
LEFT OUTER JOIN, when you join two tables you will have one on the left of the join keyword and the other one will be in the right:
FROM Table1 <------------- This is the left table.
LEFT OUTER JOIN table2 .... <------------- This is the right table.
In LEFT OUTER JOIN the unmatched rows from the left table will be included in the result set.
RIGHT OUTER JOIN the unmatched rows from the right table will be included in the result set.
CROSS JOIN this will perform a Cartesian product from the two tables.
In our query, the query will reutrn all the users from the users table only if the ref_id equal to the user_id column form the posts table.
For more information and explanations:
A Visual Explanation of SQL Joins.
Another Visual Representation of SQL Joins.
Join syntax in MySQL
SELECT user.name
FROM users
INNER JOIN posts
ON posts.ref_id == user.id
AND posts.time > 50
http://www.w3schools.com/sql/sql_join_inner.asp
I've been racking my brain for hours trying work out how to join these two queries..
My goal is to return multiple venue rows (from venues) based on certain criteria... which is what my current query does....
SELECT venues.id AS ven_id,
venues.venue_name,
venues.sub_category_id,
venues.score,
venues.lat,
venues.lng,
venues.short_description,
sub_categories.id,
sub_categories.sub_cat_name,
sub_categories.category_id,
categories.id,
categories.category_name,
((ACOS( SIN(51.44*PI()/180)*SIN(lat*PI()/180) + COS(51.44*PI()/180)*COS(lat*PI()/180)*COS((-2.60796 - lng)*PI()/180)) * 180/PI())*60 * 1.1515) AS dist
FROM venues,
sub_categories,
categories
WHERE
venues.sub_category_id = sub_categories.id
AND sub_categories.category_id = categories.id
HAVING
dist < 5
ORDER BY score DESC
LIMIT 0, 100
However, I need to include another field in this query (thumbnail), which comes from another table (venue_images). The idea is to extract one image row based on which venue it's related to and it's order. Only one image needs to be extracted however. So LIMIT 1.
I basically need to insert this query:
SELECT
venue_images.thumb_image_filename,
venue_images.image_venue_id,
venue_images.image_order
FROM venue_images
WHERE venue_images.image_venue_id = ven_id //id from above query
ORDER BY venue_images.image_order
LIMIT 1
Into my first query, and label this new field as "thumbnail".
Any help would really be appreciated. Thanks!
First of all, you could write the first query using INNER JOIN:
SELECT
...
FROM
venues INNER JOIN sub_categories ON venues.sub_category_id = sub_categories.id
INNER JOIN categories ON sub_categories.category_id = categories.id
HAVING
...
the result should be identical, but i like this one more.
What I'd like to do next is to JOIN a subquery, something like this:
...
INNER JOIN (SELECT ... FROM venue_images
WHERE venue_images.image_venue_id = ven_id //id from above query
ORDER BY venue_images.image_order
LIMIT 1) first_image
but unfortunately this subquery can't see ven_id because it is evaluated first, before the outer query (I think it's a limitation of MySql), so we can't use that and we have to find another solution. And since you are using LIMIT 1, it's not easy to rewrite the condition you need using just JOINS.
It would be easier if MySql provided a FIRST() aggregate function, but since it doesn't, we have to simulate it, see for example this question: How to fetch the first and last record of a grouped record in a MySQL query with aggregate functions?
So using this trick, you can write a query that extracts first image_id for every image_venue_id:
SELECT
image_venue_id,
SUBSTRING_INDEX(
GROUP_CONCAT(image_id order by venue_images.image_order),',',1) as first_image_id
FROM venue_images
GROUP BY image_venue_id
and this query could be integrated in your query above:
SELECT
...
FROM
venues INNER JOIN sub_categories ON venues.sub_category_id = sub_categories.id
INNER JOIN categories ON sub_categories.category_id = categories.id
INNER JOIN (the query above) first_image on first_image.image_venue_id = venues.id
INNER JOIN venue_images on first_image.first_image_id = venue_images.image_id
HAVING
...
I also added one more JOIN, to join the first image id with the actual image. I couldn't check your query but the idea is to procede like this.
Since the query is now becoming more complicated and difficult to mantain, i think it would be better to create a view that extracts the first image for every venue, and then join just the view in your query. This is just an idea. Let me know if it works or if you need any help!
I'm not too sure about your data but a JOIN with the thumbnails table and a group by on your large query would probably work.
GROUP BY venues.id