This question already has answers here:
Joining three tables using MySQL
(11 answers)
Closed last year.
I got 4 tables: galleries, areas, stores and gallery_element.
So I need to create a big query in which I could join the data(ex. name column) from galleries, areas, stores which are connected throug gallery_element table.
gallery_element has: id, gallery_id, area_id, store_id columns.
Can someone give me an simple example so I can practice with it further by myself.
Thanks!
I think it can help you to start your query:
select gallery_element.id, galleries.name, areas.name, stores.name from gallery_element
inner join galleries on galleries.id = gallery_element.galleries_id
inner join areas on areas.id = gallery_element.area_id
inner join stores on stores.id = gallery_element.store_id
Related
This question already has answers here:
How to select rows with no matching entry in another table?
(11 answers)
How to return rows from left table not found in right table?
(7 answers)
Selecting all items in one table and join with another table, allowing nulls
(4 answers)
Closed 3 years ago.
I created two tables. I keep the topics in one and the comments in this topic in the other.
When I want to view the topics, I want to see the total number of comments on the topic from the comments table.
But if there is not at least one comment in the query I wrote, it does not bring results. How can I see my topics even if there is no comment on my Inner Join query?
Thank you.
Here is my Query:
SELECT portal_topics.id, portal_topics.topicDetail, portal_topics.topicName,portal_topics.topicCategory,portal_topics.topicAuthor, portal_topics.topicTıme, portal_topics.topicAvatar,portal_topics.topicViews, portal_topics.topicLikes, COUNT(portal_comments.id) as totalCommentCount FROM `portal_topics`
INNER JOIN portal_comments ON portal_comments.topic_id = portal_topics.id
WHERE portal_comments.topic_id = portal_topics.id
GROUP BY portal_topics.topicName
Note: The query does not contain any Syntax errors. I have arranged the column names in English for everyone to understand. I may have made a mistake in this section.
This question already has answers here:
How to join two tables mysql?
(4 answers)
Closed 4 years ago.
I have two tables A and B. in Table A i have details of Subject like Subject_code, Subject_name of all the subjects in University. In table B i have details of Students like Roll_Number, Attendance, Subject_code(that that a particular roll_Number has taken etc). Now i want to fetch the Subject_name from table A corresponding to a particular Roll_number from table B;
Only linking from A to B table is the Subject_code.
I am able to get the list of the subject_code from table A as
select distinct subject_code from B;
Now i want the names from A of all the subject whose codes i got from B.
use inner join
SELECT A.*
FROM A inner join B on A.subject_code =B.subject_code
where B.Roll_number = //here enter roll number
Based on understanding of your limited problem description, a simple INNER JOIN is solution to your problem.
Try the following query ( $input_roll_number is your input value for a specific roll number, whose subject name you want to determine ):
SELECT A.roll_number, B.subject_name
FROM A
INNER JOIN B ON A.subject_code = B.subject_code
WHERE A.roll_number = $input_roll_number
This question already has answers here:
What is the difference between "INNER JOIN" and "OUTER JOIN"?
(28 answers)
Closed 5 years ago.
Order Table
Product Table
I need to select all from these two tables. Is it possible?
With the following query you can select all data from one table:
SELECT * FROM Order;
If you want to select all data from two tables you can use a join in the select query to connect the data of the two tables:
SELECT * FROM Order
JOIN Product ON Order.p_id = Product.p_id;
There are different kinds of joins available. Based on the one you use can change the amount of data you will receive. The different kinds of joins are:
(Inner) join: Returns records that have matching values in both tables
Left (Outer) join: Return all records from the left table, and the matched records from the right table
Right (outer) join: Return all records from the right table, and the matched records from the left table
Full (outer) join: Return all records when there is a match in either left or right table
The information about the different kinds of joins comes from the following website:https://www.w3schools.com/sql/sql_join.asp
This question already has an answer here:
Select rows from one table, join most recent row from other table with one-to-many relationship
(1 answer)
Closed 7 years ago.
Friends i have a problem
I have two tables channel and level
channel table
channel_id, manufacturer_id
level table
level_id,channel_id,sort_order
All channels have certain number of levels in them so like if channel has 4 rows level might have 20.
I want to know which channel has no levels at all. I have tried various solutions from stackoverflow.com but none worked for me as all of them return an empty set but I still have channels with no levels in the database. Please can anybody help. Thanks
You need to do anti join something as
select
c.* from channel c
left join level l on l.channel_id = c.channel_id
where l.channel_id is null
This question already has answers here:
Joining two tables in a MySQL
(2 answers)
Closed 8 years ago.
I want to select all from a table called Customer where CustomerID = 'AC001' and I also want to join in another table Pets where the CustomerID(fk) is the same as the CustomerID in Customer table is that possible?
Customer table
CustomerID,TypeOfCustomer, FName,Adress,City,State,Zipcode,PhoneNr,FaxNr
Pets table
PetID,FName, Animal,Breed,Gender,DoB,CustomerID(fk)
This is a very basic SQL question, here you go: to join the two tables together, do this:
SELECT *
FROM Customer
JOIN Pets ON Pets.CustomerId=Customer.CustomerID
To filter for CustomerID = 'AC001', add a WHERE clause.
Note also that the result won't contain customers without any pets. If you want to include those as well, do a LEFT JOIN instead.
Generally, I'd recommend reading a good beginner-level book on SQL and relational databases to make sure you grasp the underlying concepts here.
Select //fields you want// from Customer C, Pets P
WHERE C.CustomerID=P.CustomerID