I'm currently storing tweets from twitter in a database and I'm storing the user fields in a separate table. I then have a foreign key which links the userid to the tweet. I'm wondering how I should show all of the information from both of the tables.
Use an inner join.
select *
from tweets inner join users on tweets.user_id = users.user_id
Select t.message, u.name, u.email
From Tweets t, UsersInfo u
Where t.userid = u.id
You don't give any schema info, so I've made assumptions.
select tweet, date, username from tweets
join user on user.id=tweets.userid;
Related
Newbie here.. Here's what I'm trying to do.
I have a Posts table with the following columns
id, userid, bodyText, date
and I have another table for users users.
When users submit a post, the user-id saves into the "posts" table under "userid". Well, I want to display that users information, such as name and picture, on the posts using the "userid" to get each users information so that their name and picture shows along with the post they submitted.
Sorry if I'm not being clear, english is not my first language and like I said, I'm new at this and still trying to learn.
I had it where when they submit the post, their name and picture also saves into the "posts" table but I want to change it because if the user updates their name or picture, it will still show the name and picture they had when they submitted the post. I want their name and picture to update on the posts if they update their information on the users table.
What you are asking about is a JOIN. In general the Join will look like
SELECT p.id. p.bodyText, p.date, u.name, u.picture FROM posts as p INNER JOIN users as u ON p.user_id = u.id where p.id = 123;
This will select the post with the ID 123 from the posts table and joins the users information from the users table based on the user_id columns value from the posts table.
In Syntax this could be something like
$sth = $dbh->prepare("SELECT p.id. p.bodyText, p.date, u.name, u.picture FROM posts as p INNER JOIN users as u ON p.user_id = u.id where p.id = ?");
$sth->execute(array(123));
$red = $sth->fetchAll();
I need to fetch all entries from a table titled users and JOIN a user from the same table based on a userID in the original users entry . I have a simple JOIN query that completes this requirement but I only want to return two columns (userID and fullName) during the JOIN. Currently I'm returning the whole user entry from the JOIN and obviously the column names overlap. For our application's purposes, I need to rename the columns returned from the JOIN. I'm currently using the query below.
SELECT * FROM users u1
JOIN users AS u2
ON(u1.dealer = u2.userID)
This seems like it should be relatively simple but I can't seem to figure it out. I've searched for hours but haven't found a clear solution.
SELECT u1.userID as userID,u1.fullName as fullName,
u2.userID as dealeruserID,u2.fullName as dealerfullName
FROM users u1 JOIN users AS u2 ON(u1.dealer = u2.userID)
I am assuming you need user data and their corresponding Dealers.
Just a thought - for the dealer users - what is their value of "dealer" ?
With the help from Simone I was able to modify her answer to fit my use case.
SELECT u1.*,
u2.userID as dealeruserID,
u2.fullName as dealerfullName
FROM users u1
JOIN users AS u2 ON(u1.dealer = u2.userID)
I have three table,table names are user,trade,trade_photo.Here I have attached the table.
my problem is,
I want to select the trade table_table image data.
how to select the image based in user_id?
please any one help to me?
something like this
select * from user u,trade t, trade_photo tp where u.user_id=t.user_id and t.trade_id=tp.trade_id;
if you want to select for a particular user
select * from user u,trade t, trade_photo tp where u.user_id=some_id and u.user_id=t.user_id and t.trade_id=tp.trade_id;
There is no need to join user table since user_id is already in the trade table.
Whith the supplied information
user
user_id
trade
user_id
trade_id
trade_photo
image
trade_id
You can try something as
select
u.user_id ,
t.image
from
trade_photo tp
inner join trade t on t.trade_id = tp.trade_id
inner join user u on u.user_id = t.user_id
where u.user_id = '{some user id}'
Its always better to provide some sample data and expected output, so
that a proper suggestion could be provided.
Sorry but I am not sure how to ask this question but I am working on a help desk application where I have tickets being created in one table. I also have another table that stores the users. My problem is with the tickets table, I have listed the user that created the ticket, the tech who will solve the ticket and a user that over sees the ticket. All three users reference the users table. So how do I can I query the tickets table and get all three users that reference the same table storing the users?
Table1: Tickets
1) Ticketnumber
2) EnteredBy User 100
3) Issue
4) FixedBy User 102
5) FixedByNotes
6) ResponsilbeUser User 103
Table2: Users
1) UserID
2) UserName
What I can do now is something like this:
Select Ticketnumber, EnteredBy, Issue, UserName FROM Tickets INNER JOIN Users
ON Tickets.EnteredBy = Users.UserID
Thanks Steve
You can extend current query to somewhat as follows:
Select Ticketnumber, Issue, Reporter.UserName, Developer.UserName, Manager.UserName FROM Tickets
INNER JOIN Users AS Reporter ON Tickets.EnteredBy = Reporter.UserID
INNER JOIN Users AS Developer ON Tickets.FixedBy = Developer.UserID
INNER JOIN Users AS Manager ON Tickets.ResponsibleUser = Manager.UserID
You need alias for joint tables if you want to get all names:
Select Ticketnumber, Issue, Informers.UserName, Fixers.UserName, Supervisors.UserName FROM Tickets
INNER JOIN Users Informers ON Tickets.EnteredBy = Users.UserID
INNER JOIN Users Fixers ON Tickets.FixedBy = Users.UserID
INNER JOIN Users Supervisors ON Ticket.ResponsibleUser = Users.UserID
WHERE...
Sorry as i am not able to understand your words, but if I assumed your need correctly.. just for a try this could help you..
if you need either of them i.e. all users who has either entered or fixed or saw an issue you can find by..
Select t.Ticketnumber, t.EnteredBy, t.Issue, u.UserID ,u.UserName FROM Tickets t
INNER JOIN Users u ON t.EnteredBy = u.UserID or t.FixedBy = u.UserID
or t.ResponsibleUser = u.UserID;
And If you need all users who has entered, fixed and saw an issue you can find by..
Select t.Ticketnumber, t.EnteredBy, t.Issue, u.UserID ,u.UserName FROM Tickets t
INNER JOIN Users u ON t.EnteredBy = u.UserID and t.FixedBy = u.UserID
and t.ResponsibleUser = u.UserID;
I need to build an activity feed to go on each users profile page showing what they have been doing on the site.
There is three tables: comments, ratings, users
I want the feed to include the comments and ratings that the user has posted.
in the comments and ratings table it stores the user id of the user who posted it, not the username, so in for each item in the news feed it needs to select from the users table where the user id is the same to retrieve the username.
All the entries in the feed should be ordered by date.
Here is what ive got even though i know it is not correct because it is trying to match both with the same row in the users table.
SELECT comments.date, comments.url AS comment_url, comments.user_id, ratings.date, ratings.url AS rating_url, ratings.user_id, users.id, users.username
FROM comments, ratings, users
WHERE comments.user_id=%s
AND comments.user_id=users.id
AND ratings.user_id=%s
AND ratings.user_id=users.id
ORDER BY ratings.date, comments.date DESC
JOIN. It seems you know that, but here's how:
SELECT * FROM comments LEFT JOIN users ON comments.user_id = users.id
Thus, as far as I can tell, you're trying to order two separate things at the same time. The closest I think I can come up with would be something like:
(SELECT comments.date AS date, users.username AS name, comments.url AS url CONCAT('Something happened: ',comments.url) AS text
FROM comments LEFT JOIN users ON comments.user_id = users.id
WHERE users.id = %s)
UNION
(SELECT ratings.date AS date, users.username AS name, ratings.url AS url CONCAT('Something happened: ',ratings.url) AS text
FROM comments LEFT JOIN users ON comments.user_id = users.id
WHERE users.id = %s)
ORDER BY date DESC LIMIT 0,10
Note that the columns of both parts of the union match up. I'm pretty sure that that is required for something like this to work. That's why I have that CONCAT statement, which lets you build a string that works differently between ratings and comments.