I've got two tables in my database. Table 1 is a list of "timelines" and their corresponding owners and title.
Table 2 is a list of users who have access to the timelines but are followers, not owners.
I'm trying to write a query that outputs the lineID's and corresponding titles that are linked to a userID in either of the two tables.
A query for userID 1 would ideally output:
1 a
2 b
3 c
6 f
Hopefully this isn't too confusing but the purpose is to fill a dynamically generated select box with the LineID and Title for a given UserID...
Table 1 ("owners")
--------------------------
| LineID | UserID | Title |
| 1 | 1 | a |
| 2 | 1 | b |
| 3 | 1 | c |
| 4 | 2 | d |
| 5 | 2 | e |
| 6 | 1 | f |
--------------------------
Table 2 ("followers")
----------------------------
| RowID | LineID | UserID |
| 1 | 1 | 1 |
| 2 | 1 | 2 |
| 3 | 3 | 1 |
| 4 | 3 | 2 |
| 5 | 2 | 2 |
| 6 | 6 | 1 |
----------------------------
I tried using:
SELECT title
FROM `lines`
LEFT JOIN follow
ON follow.user_id = lines.user_id
WHERE follow.user_id = 1
That ended up producing duplicate rows.
The output I need would ideally be an array consisting of all the lineID's and Titles associated with that userID.
select LineId, Title
from owners
where LineId in (select LineId from followers group by LineId )
order by owners.LineId
Related
How do I make a table of results of two different ratings without creating a cartesian product. diffrating and hostrating are two different types of user ratings. The users are rating the spots which are are labeled with spotId. userdiffrating and userhostrating are linking the users ratings to the correct spots. I am trying to get all the ratings for a specific spot in a table. Sample data and the expected output are bellow.
Table contents:
userdiffrating:
-------------------------------
| RatingId | userId | spotId |
-------------------------------
| 1 | 1 | 1 |
-------------------------------
| 2 | 2 | 1 |
-------------------------------
| 3 | 1 | 2 |
-------------------------------
diffrating:
----------------------
| RatingId | userId |
----------------------
| 1 | 5 |
----------------------
| 2 | 2 |
----------------------
| 3 | 4 |
----------------------
userhostrating:
-------------------------------
| RatingId | userId | spotId |
-------------------------------
| 1 | 1 | 1 |
-------------------------------
| 2 | 2 | 1 |
-------------------------------
| 3 | 1 | 1 |
-------------------------------
hostrating:
----------------------
| RatingId | userId |
----------------------
| 1 | 1 |
----------------------
| 2 | 3 |
----------------------
| 3 | 4 |
----------------------
This is what I originally tried but this creates a cartesian product:
SELECT D.rating diffrating, H.rating hostrating FROM diffrating D
JOIN userdiffrating UD ON D.ratingId = UD.ratingId
JOIN userhostrating UH ON UD.spotId = UH.spotId
JOIN hostrating H ON UH.ratingId = H.ratingId WHERE UD.spotId = 1
Result from first query (cartesian product):
-------------------------
| diffrating| hostrating|
-------------------------
| 5 | 1 |
-------------------------
| 5 | 3 |
-------------------------
| 5 | 4 |
-------------------------
| 2 | 1 |
-------------------------
| 2 | 3 |
-------------------------
| 2 | 4 |
-------------------------
I tried this next query but I cant use a select statement that has more than one row as a subquery:
SELECT D.rating AS diffrating, H.rating AS hostrating
FROM diffrating D, hostrating H
WHERE D.ratingId = (SELECT ratingId FROM userdiffrating UD WHERE UD.spotId = 1)
AND H.ratingId = (SELECT ratingId FROM userhostrating UH WHERE UH.spotId = 1)
This is the expected result (all diff and host ratings for spotId = 1):
-------------------------
| diffrating| hostrating|
-------------------------
| 5 | 1 |
-------------------------
| 2 | 3 |
-------------------------
| NULL | 4 |
-------------------------
This is the database:
Is this possible and how would this be done?
Thanks
I think what you are trying to code is this
SELECT dr.rating diffratingval, hr.rating hostratingval
FROM diffrating dr
JOIN userdiffrating udr
ON dr.ratingid = udr.ratingid
JOIN userhostrating uhr
ON udr.spotid = uhr.spotid
JOIN hostrating hr
ON uhr.ratingid = hr.ratingid
AND dr.ratingid = hr.ratingid
WHERE udr.spotid = 60;
I need a help with mySQL SELECT query from multiple tables. I have got four tables: school, discipline, pupils and teams.
School table looks like:
+------+---------+---------------+----------+
| id | name | discipline_id | pupil_id |
+------+---------+---------------+----------+
| 1 | one | 2 | 5 |
+------+---------+---------------+----------+
| 2 | two | 3 | 8 |
+------+---------+---------------+----------+
| 3 | three | 4 | 12 |
+------+---------+---------------+----------+
Discipline table looks like:
+------+---------+
| id | name |
+------+---------+
| 1 | math |
+------+---------+
| 2 | bio |
+------+---------+
| 3 | liter |
+------+---------+
| 4 | geo |
+------+---------+
Teams table looks like:
+------+---------+---------------+-----------+
| id | name | school_id | member_id |
+------+---------+---------------+-----------+
| 1 | T1 | 1 | 3 |
+------+---------+---------------+-----------+
| 2 | T2 | 3 | 3 |
+------+---------+---------------+-----------+
| 3 | T3 | 2 | 9 |
+------+---------+---------------+-----------+
The result of disciplines I need to get with a "SELECT from discipline..." query by "member_id = 3" is:
+-----------------+---------------+
| discipline_name | discipline_id |
+-----------------+---------------+
| bio | 2 |
+-----------------+---------------+
| geo | 4 |
+-----------------+---------------+
By matching member's school and then getting its discipline, if it makes sense...Is it possible to do with just one mySQL query?
Type of: member_id 3 => school_id 1,3 => discipline_id = show related disciplines names and ids which are 2, 4
Thank you very much...
Your goal is not clear or makes no sense to me.
But here is what you are literally asking for:
SELECT
s.discipline_id
d.name
FROM teams t
LEFT JOIN school s
ON s.id = t.school_id
LEFT JOIN discipline d
ON d.id = s.discipline_id
WHERE t.member_id = 3
I'm trying 3 join tables so i can report who has the highest calls for each single customer please see the tables below
+-------+--+------------+
| users | | |
+-------+--+------------+
| id | | first name |
| 1 | | Bill |
| 2 | | Ben |
| 3 | | Bob |
| 4 | | Barry |
+-------+--+------------+
the second table is a call customers table
+-----------+--+-------------------+
| customers | | |
+-----------+--+-------------------+
| id | | Company |
| 1 | | windows company |
| 2 | | glass company |
+-----------+--+-------------------+
the third table is the where to calls are record
+-------------+--+--------+--------------+
| callrecords | | | |
+-------------+--+--------+--------------+
| id | | userid | company id |
| 1 | | 1 | 1 |
| 2 | | 1 | 1 |
| 3 | | 1 | 1 |
| 4 | | 2 | 1 |
| 5 | | 2 | 2 |
| 6 | | 2 | 2 |
+-------------+--+--------+--------------+
So as you can see in the call record table company id 1 which is the windows company has had 4 calls but user 1 made the most so that company i need to display bill company id 2 which is the glass company need to display user id 2 because they made 2 calls in total and not user id 1 because they only made 1 call
so the mysql query i need to make needs to loop round so the report looks like this
windows company - most calls bill
glass company - most calls Ben
If you want a single query that will fetch records. You can check below query. This will give you highest calls for each single customer.
SELECT CR.companyid, C.company, U.first_name, COUNT(CR.userid) AS callCount
FROM callrecords AS CR
INNER JOIN customers AS C ON (C.id= CR.companyid)
INNER JOIN users AS U ON (U.id= CR.userid)
GROUP BY C.id,CR.userid HAVING callCount = (
SELECT count(callrecords.userid) as count
FROM callrecords
WHERE callrecords.companyid = CR.companyid
GROUP BY callrecords.userid
ORDER BY count DESC
LIMIT 1
);
Ignore spells of table or column name because table's or column's name in question is not well formatted.
I am designing a simple architecture where i have a table which stores users and some elements that they like so my table structure is something like this:
+---------+---------+
| user_id | like_id |
+---------+---------+
| 1 | 4 |
| 2 | 2 |
| 4 | 4 |
| 4 | 3 |
| 5 | 4 |
| 6 | 7 |
| 7 | 5 |
| 34 | 6 |
| 3 | 8 |
| 2 | 3 |
| 2 | 5 |
| 1 | 3 |
| 1 | 10 |
| 1 | 12 |
| 2 | 10 |
+---------+---------+
Now what i will have is id of any user (lets say user_id = 1 ) and i want a query to get all the other users who have similar Likes as that of 1.
So in the Output for user_id = 1 will be :
+---------------------------+------------------------+----------------+
| users_with_common_likes | no_of_common_likes | common_likes |
+---------------------------+------------------------+----------------+
| 4 | 2 | 3,4 |
| 2 | 2 | 3,10 |
| 5 | 1 | 4 |
+---------------------------+------------------------+----------------+
What I have achieved :
I can do this using a sub-query as below :
SELECT user_id
FROM `user_likes`
WHERE `like_id`
IN (
SELECT GROUP_CONCAT( `like_id` )
FROM user_likes
WHERE user_id =1
)
AND user_id !=1
LIMIT 0 , 30
However this query is not giving all the users,it misses the user_id = 2 which has like id 3 in common with user_id=1.
and i cant figure out how to find the remaining 2 columns.
Also I feel that this is not the best way to to this as this table will contain thousands of data and it may effect system performance.
I would like to do this with a single Mysql Query.
This assumes a PK formed on user_id,like_id...
SELECT y.user_id
, GROUP_CONCAT(y.like_id) likes
, COUNT(*) total
FROM my_table x
JOIN my_table y
ON y.like_id = x.like_id
AND y.user_id <> x.user_id
WHERE x.user_id = 1
GROUP
BY y.user_id;
Given a join table for m-2-m relationship between booth and user
+-----------+------------------+
| booth_id | user_id |
+-----------+------------------+
| 1 | 1 |
| 1 | 2 |
| 1 | 5 |
| 1 | 9 |
| 2 | 1 |
| 2 | 2 |
| 2 | 5 |
| 2 | 10 |
| 3 | 1 |
| 3 | 2 |
| 3 | 3 |
| 3 | 4 |
| 3 | 6 |
| 3 | 11 |
+-----------+------------------+
How can I get a distinct set of booth records that are common between a subset of user ids? For example, if I am given user_id values of 1,2,3, I expect the result set to include only booth with id 3 since it is the only common booth in the join table above between all user_id's provided.
I'm hoping I'm missing a keyword in MySQL to accompish this. The furthest I've come so far is using ... user_id = all (1,2,3) but this is always returning an empty result set (I believe I understand why it is though).
The SQL query for this will be:
select booth_id from table1 where [user_id]
in (1,2,3) group by booth_id having count(booth_id) =
(select count(distinct([user_id])) from table1 where [user_id] in (1,2,3))
If this could help you creating the MySQL query.