i am creating groups for my website. i have following tables
user table which contain all user details
cc_group_member table for users group details in this i have user id, group id
communication_center_groups table for groups .
i want to search user for add in a group. but when i search then it show duplicate data. problem is this.. which user is alreay a member of that group it is also show in search result.
i have 4 invitation status in group table which reffer
0- send request
1-accpet
2-reject
3-cancel.
i want if user reject or cancel request thay also show in result but only 1 time it show 2 times in my result. please help..
thanx.
SELECT u.*,cc.invitation
FROM user u
left join (select distinct(user_id),invitation
from cc_group_member
where group_id='$groupId'
and (invitation = '3' or invitation = '2') ) as cc ON u.id = cc.user_id
where (u.username like '".$condition."%' or u.first_name like '".$condition."%' or last_name like '".$condition."%')
and u.type !='1' and u.type = '$user_type'
ORDER BY u.username
SELECT u.*,cc.invitation
FROM user u left join (select distinct(user_id),invitation
from cc_group_member
where group_id='10'
and (invitation = '3' or invitation = '2') ) as cc ON u.id = cc.user_id
where (u.username like '1%' or u.first_name like '1%' or last_name like '1%')
and u.type !='1' and u.type = '5'
ORDER BY u.username
I could not understand your question.but if your are having duplicate result you can make use of select distinct and for your second part you can add another field in database which tells whether this user is member or not
You can use UNION
http://www.w3schools.com/sql/sql_union.asp
simply use union with your different condition and get your all records
Related
I made a query that user can see all the post of active users but not of those inactive, but also they should not see the post of users they blocked or blocked them how can I do that?, the block_users table has block_by_userid and blocked_userid column.
I tried INNER JOIN the post table with members table which every inactive users post cannot be seen anymore., How will I combine the block_users table?
$GetPost = "SELECT Post.* FROM Post
INNER JOIN Members ON Post.Poster_user_id = Members.User_id
WHERE Status='active'";
you might try FULL OUTER JOIN
the idea it to get all items in both tables member and block_users and then filter the data using where clause, i am sorry if i miss using the fields name , so please check the tables names, i assume block_users.block_by_userid contained the blocked user id if not use the correct field
$GetPost = "SELECT Post.* FROM Post
INNER JOIN Members ON Post.Poster_user_id = Members.User_id
FULL OUTER JOIN block_users ON Members.User_id = block_users.user_id
WHERE Status='active'
AND
WHERE block_users.block_by_userid != Members.User_id";
Suppose I am doing this for a user xyz whose user_id is 123 then below is a query which will return expected output for user 123.
Query:
SELECT Post.* FROM Post
INNER JOIN Members ON Post.Poster_user_id = Members.User_id
WHERE Status='active' and post.poster_user_id NOT IN(select block_by_userid from block_users where blocked_user_id = 123 UNION select blocked_user_id from block_users where block_by_userid = 123)
I'm having a hard time wrapping my head around the SQL I need to pull data about other users that belong to the same group as the logged in user in my PHP application.
The data structure looks like this:
User Table
user_id
name
status
bio
Group Table
group_name
user_id
What I'm trying to do is create a page that shows the bios for all of the other members of the same group or groups that a user belongs to.
I've tried this SQL:
SELECT list.listname, list.user_id, list.groupname
FROM list
LEFT JOIN user_group ON list.user_id = user_group.user_id
WHERE user_group.user_id = 'test#testuser.com'
ORDER BY list.groupname
But I just get back the bio for test#testuser.com, and no other bios. If I remove the WHERE portion of the statement, I get all bios for all users, and not just the bios of users that are in the same group as my test#testuser.com. The logged in user may belong to more than one group.
Any ideas about how to grab this data?
This returns the groups for a given user:
SELECT l.groupname
FROM list l
WHERE l.user_id = 'test#testuser.com'
ORDER BY l.groupname;
If you want all users in the groups
SELECT l.listname, l.user_id, l.groupname
FROM list l LEFT JOIN
user_group ug
ON l.user_id = ug.user_id
WHERE l.groupname IN (SELECT l2.groupname
FROM list l2
WHERE l2.user_id = 'test#testuser.com'
)
ORDER BY l.groupname;
You can do it by self-joining the list table:
SELECT l.listname, l.user_id, l.groupname
FROM list l
LEFT JOIN user_group ug ON l.user_id = ug.user_id
INNER JOIN list l2 ON l2.groupname = l.groupname
AND l2.user_id = 'test#testuser.com'
ORDER BY l.groupname;
I have two tables: publick_feed and users
I want to SELECT all from public_feed and also SELECT a three columns from users whose id is the same of user_id in public_feed
and assign the rows returned from public_feed to the column in users table ( correspondent)
I try this:
<?php
$sql = "
SELECT * FROM public_feed
WHERE user_id IN
(SELECT id FROM users) AND
(SELECT Firstname,Lastname,Avatar FROM users WHERE id IN(SELECT user_id FROM public_feed))
";
$query = mysqli_query($dbc_conn,$sql);
if(mysqli_num_rows($query) > 0){
while($row = mysqli_fetch_assoc($query)){
//echo rows with correspondent details from the users table
echo $row['user_id'];
}
}
<?
Please any help will be much appreciated.
Thank you.
Or version with left join in case if there is no user in public_feed, and you still want to fetch user data
SELECT
u.*, f.*
FROM
public_feed f LEFT JOIN
users u ON f.user_id = u.id;
Because author asked for explanation, here it is:
First we are going to use table name alias to make query shorter
public_feed f
and
users u
we are saying that want to refer to tables with an alias. Of course * means that we want to select all columns
SELECT users.*, public_feed.*
is equal to
SELECT u.*, f.*
Of course you can use any other letters as an alias
Next we are saying that public_feed.user_id must be equal to users.id. But when public feed entry does not exists just display columns with null values. This is why we are using LEFT JOIN instead of INNER JOIN. In general JOINS are used to fetch related data from more than one related tables.
ON keyword is saying values from which columns in the tables must be equal to satisfy the request
I think doing a join would be cleaner than using a complicated subquery:
SELECT u.Firstname,
u.Lastname,
u.Avatar,
COALESCE(pf.User_id, 'NA'),
COALESCE(pf.Post, 'NA'),
COALESCE(pf.Date, 'NA')
FROM users u
LEFT JOIN public_feed pf
ON u.Id = pf.User_id
I chose a LEFT JOIN of users against public_feed on the assumption that every feed will have an entry in the users table, but not necessarily vice-versa. For those users who have no feed entries, NA would appear in those columns and that user would appear in only a single record.
I am currently building a custom CMS to help me learn PHP and MYSQL. I have two database tables 'users' and 'articles'. When the user submits an article, the field 'author_id' in the 'articles' table places to the users 'users_id' from the 'users' table. This way i can join the tables and get all the articles from that user. Now i am trying to make a feature section on the home page. I want to loop through all authors/users and get one article from that user. Here is a sample of my code...
$author= db::getInstance()->query("SELECT * FROM users, articles WHERE user_id = author_id");
foreach($author->results() as $author) {
echo $author->profile_img;
echo $author->user_name
echo $author->article_title;
}
This works fine if the user has only posted one article but if there are more than 1 then it will loop through all the posts of that user. I just want to echo 1 article from each user but not sure how i can achieve this. Can anyone point me in the right direction?
Many Thanks,
Louis Lombardi
If you want one arbitrary article for each user, you can use a MySQL (mis)feature that allows you to do "partial" aggregations:
SELECT u.*, a.*
FROM users u JOIN
articles a
ON u.user_id = a.author_id
GROUP BY u.user_id;
My preferred method for a random article would be more like this:
select u.*, a.*
from (select u.*,
(select a.article_id
from articles a
where a.author_id = u.user_id
order by rand()
limit 1
) as article_id
from users u
) u join
articles a
on u.article_id = a.article_id;
Finally, my preferred method for getting the first/last would look something like this:
SELECT u.*, a.*
FROM users u JOIN
articles a
ON u.user_id = a.author_id
WHERE a.article_id = (SELECT MAX(a2.article_id)
FROM articles a2
WHERE a2.author_id = u.author_id
);
You can use MySql limit:
SELECT * FROM users, articles WHERE user_id = '$author_id' limit 0,1
Complete documentation: https://dev.mysql.com/doc/refman/5.5/en/limit-optimization.html
I have a user table, e.g.
userId
userName
and I have a message table, e.g.
messageId
messageToId
messageFromId
messageContent
I am trying to make a query to pull a message, but also get the user names from the user table based on the messageToId and messageFromId.
I have done this before with only 1 field between tables, e.g.
SELECT message.*, user.userName
FROM message, user
WHERE user.userId = message.messageToId
AND messageId = (whatever)
But I am having trouble with 2 links.
I want the result as follows:
messageId
messageToId
toUserName
messageFromId
fromUserName
messageContent
Any help would be much appreciated, or if someone had another way of attempting a private message system with PHP/MySQL.
You just have to use joins and different table aliases:
SELECT m.*, u1.userName AS toUserName, u2.username AS fromUserName
FROM message m INNER JOIN user u1 ON m.messageToId = u1.userId
INNER JOIN user u2 ON m.messageFromId = u2.userId
WHERE messageId = "XXX";
You need to use a join from to achieve this:
SELECT `m`.*,
`to`.`userName` AS `to`,
`from`.`userName` AS `from`,
FROM `message` `m`
JOIN `user` `to` ON `m`.`messageToId` = `to`.`userId`
JOIN `user` `from` ON `m`.`messageFromId` = `from`.`userId`
WHERE `m`.`messageId` = 1
So you join against the user table twice to get both users for a particular message. To do this you need to use table aliases as I have done with to and from so that you distinguish between them.
I have also used a field alias to get their usernames separately eg:
`to`.`username` AS `from`
Will this work?
SELECT b.userName AS author, c.userName AS reciever, a.messageId, a.messageContent FROM message a JOIN user b ON a.messageFromId = b.userId JOIN user c ON a.messageToId = c.userId