I have 2 table in my database. The first is comments and the other is comments_votes.
I want to select all comments, and for each comment, select all it's votes from comments_votes, add them up together and join it with the first query as totalVote.
My comments table look like:
id comment video_id date_sent
----------------------------------------
5 "...." 99 "2017-05-23"
18 "...." 99 "2017-05-23"
comments_votes table look like:
id user_id comment_id vote
----------------------------------------
45 86 5 1
45 23 5 1
78 12 18 -1
And the final wished result would look like:
id comment video_id votes_total
----------------------------------------
5 " ... " 99 2
18 "... " 99 -1
I can manage simple SQL operations but this is beyond me. Is something like this even possible? If yes, how?
select C.id, C.Comment, C.Video_ID, SUM(V.Votes) AS Vote_total
from comments C
left outer join comments_votes V
on C.id=V.comment_id
group by C.id, C.Comment, C.Video_ID
SELECT c.id,comment,c.video_id,SUM(v.vote) AS Vote_total
FROM comments c, comments_votes v
WHERE c.id = v.comment_id
GROUP BY C.id, C.Comment, C.Video_ID;
Related
The user table looks like this:
user_id
name
surname
1
a
aa
2
b
bb
3
c
cc
The book's table looks like this:
user_id
book_name
1
book1
1
book2
1
book3
2
book1
The expenses table looks like this:
user_id
amount_spent
date
1
10
2020-02-03
1
30
2020-02-02
1
10
2020-02-01
1
15
2020-01-31
1
13
2020-01-15
2
15
2020-02-01
3
20
2020-02-01
The result which I want:
CountUsers
amount_spent
2
65
Explanation: I want to count how many users have book1 and how much total they spend on a date between 2020-02-01 - 2020-02-03.
Now how the query should look like?
I am using MySQL version 8.
I have tried:
SELECT
count(*), sum(amount_spend) as total_amount_spend
FROM
(select sum(amount_spend) as amount_spend
FROM expanses
LEFT JOIN books ON books.user_id = expanses.user_id WHERE books.book_name ='book1 GROUP BY expanses.user_id) src'
And the result is wrong because I am getting a higher amount_spend than in my table result above. I think while joining the table there are some duplicates but I do not know how to fix them.
I want to count how many users have book1 and how much total they spend on a date between 2020-02-01 - 2020-02-03.
I am thinking:
select count(*), sum(e.amount_spent)
from user_books ub join
expenses e
on ub.user_id = e.user_id
where book_name = 'book1';
Note: This assumes that user_books doesn't have duplicate rows.
FIDDLE
You miss the date part in your code.
SELECT
count(*), sum(amount_spent) as total_amount_spend
FROM
(select sum(amount_spent) as amount_spent
FROM expanses
LEFT JOIN books ON books.user_id = expanses.user_id
WHERE books.book_name ='book1'
and expanses.date between '2020-02-01' and '2020-02-03'
GROUP BY expanses.user_id) src;
will do a job.
Please note that you don't need to have left join here (unless you're sure that it may happen that no expenses at all for given user will be), and you don't need to have grouping in subquery. So your query could look like:
select count(distinct expanses.user_id), sum(amount_spent) as amount_spent
from expanses
inner join books on books.user_id = expanses.user_id
where books.book_name ='book1'
and expanses.date between '2020-02-01' and '2020-02-03';
Could you guys help me to make SELECT query for my simple case:
Table A:
UserID UserName
10 John
11 Mike
12 Matt
Table B:
SessionID UserID SessionTime
124 10 20
123 10 122
42 10 30
324 11 55
534 11 42
344 12 19
653 12 32
I need this result:
Result Table:
UserName UserID TotalTime
John 10 172
Mike 11 97
Matt 12 51
For one Table B this works:
SELECT UserID, SUM(SessionTime) AS "Total Time"
FROM TableB
GROUP BY UserID;
but I need to attach UserName to the final result
thank you
You can do that by using join and group by:
select a.UserId, a.UserName, sum(b.SessionTime) as TotalTime
from tableA a
left join tableB b on a.UserId = b.UserId
group by a.UserId, a.UserName;
Note: This would work for 1-to-many relations as in your case.
SELECT TableA.Username, TableA.User_ID, SUM(SessionTime) INNER JOIN
TableB ON TableA.User_ID = TableB.User_ID GROUP BY TableA.Username,
TableA.User_ID
SELECT a.UserName as "UserName"
,a.UserID as "UserID"
,sum(b.SessionTime) as "TotalTime"
FROM a LEFT JOIN b
ON a.UserID = b.UserID GROUP BY a.UserID
Here. I used TABLE a and Table b
I'm having a lot of trouble figuring out how to write this query. Here's an exmaple of the data set and what I need to query:
**System Table**
SystemID Active
1 T
2 T
3 T
4 F
5 F
6 F
**BlogPost Table**
BlogPostID SystemID Create_Month
100 2 Jan
101 2 Jan
102 2 Feb
103 3 Feb
104 3 Mar
105 6 Mar
106 6 Mar
**Comment Table**
Comment ID BlogPostID Liked
201 100 T
202 100 T
203 100 T
204 102 T
205 102 T
206 102 T
207 103 F
So, In words, I'm trying to get: By month, show me all the active systems who created a post during that month, the number of posts they made in aggregate, and the count of the subset of those posts who had a comment that was like.
The end result would be like:
Column 1 - Month
Column 2 - Count of Active Systems where a Post Created in Month
Column 3 - Count of Posts Applicable to those systems
Column 4 - Count of Applicable Posts that had comments that were liked
I don't even know where to start really. My terrible "this is obviously wrong" attempt is below. Any help is much appreciated, thanks!
SELECT
Month,
COUNT(DISTINCT system.systemid),
COUNT(blogpost.BlogPostID)
COUNT(comments.commentiD)
FROM
system INNER JOIN
blogpost ON system.systemid = blogpost.systemid INNER JOIN
comments ON blogpost.BlogPostID = comment.BlogPostID
WHERE
system.active = T
AND comments.like = T
GROUP BY month
A complicated one !
SELECT
b.Create_Month,
COUNT(DISTINCT s.SystemID) as SystemCount,
COUNT(DISTINCT b.BlogPostID) as PostsCount,
COUNT(DISTINCT t.BlogPostID) as PostsWithLike
FROM System s
JOIN BlogPost b
ON s.systemID = b.systemID
AND s.Active = 'T'
LEFT JOIN Comment c
ON b.BlogPostID = c.BlogPostID
LEFT JOIN
(
SELECT DISTINCT c.BlogPostID as BlogPostID
FROM
Comment c
GROUP BY c.BlogPostID
HAVING SUM(if(c.Liked='T',1,0))>0
) as t
ON b.BlogPostID = t.BlogPostID
GROUP BY b.Create_Month
This is probably what you want :
SELECT s.systemid, active, bp.create_month, bp.systemid, COUNT(bp.blogpostid), COUNT(c.liked)
FROM system AS s
LEFT OUTER JOIN Blogpost AS bp ON s.systemid = bp.systemid
LEFT OUTER JOIN Comment AS c ON bp.blogpostid = c.blogpostid
WHERE active = 'T' AND c.Liked = 'T' GROUP BY s.systemid,bp.create_month
I have a query
SELECT p.*, m.*,
(SELECT COUNT(*) FROM newPhotoonAlert n WHERE n.userIDfor='$id' AND n.threadID=p.threadID and n.seen='0') AS unReadCount
FROM posts p
JOIN myMembers m ON m.id = p.user_id
LEFT JOIN following f
ON (p.user_id = f.user_id AND f.follower_id='$id'
AND f.request='0' AND f.status='1')
JOIN myMembers searcher ON searcher.id = '$id'
WHERE ((f.follower_id = searcher.id) OR m.id='$id')
AND p.flagged <'5'
ORDER BY p.threadID DESC,p.positionID
It brings result as expected but I want to add Another CLAUSE to limit the results.
Say a sample (minimal shown) set of data looks like this with the above query.
threadID postID positionID url
564 1254 2 a.com
564 1245 1 a1.com
541 1215 3 b1.com
541 1212 2 b2.com
541 1210 1 b3.com
523 745 1 c1.com
435 689 2 d2.com
435 688 1 a4.com
256 345 1 s3.com
164 316 1 f1.com
.
.
I want to get ROWS corresponding to 2 DISTINCT threadIDs starting from MAX, but I want to include duplicates as well.
Something like
AND p.threadID IN (Select just Two of all threadIDs currently selected, but include duplicate rows)
So my result should be
threadID postID positionID url
564 1254 2 a.com
564 1245 1 a1.com
541 1215 3 b1.com
541 1212 2 b2.com
541 1210 1 b3.com
You may use something like this:
select threadID, postID, positionID, url
from your_table where
threadID in
(select * from (select distinct threadID from your_table order by threadID desc limit 10) as tab_alias);
Try this syntax to implement it.
So I have the following query which fetches active competitions for an organisation, but also aims to fetch the user that is in the lead - for each competition fetched.
The query currently works in that it fetches the competitions, however it currently fetches all the users and I would like to LIMIT 1 on the users fetched, using the SUM(activity_weight) you can see below.
The results come out like this (removed some results to make it easy to see) and in my case, I only want to fetch John and Sally, as they are the leaders of the competitions.
competitionId compName start_date end_date name totalPoints
------------------------------------------------------------
123 First Comp 13-09-09 13-10-09 John 100
123 First Comp 13-09-09 13-10-09 Bob 50
431 Second Comp 13-05-04 13-10-05 Sally 500
431 Second Comp 13-05-04 13-10-05 Jessica 50
I understand that I must use some form of subquery to use the LIMIT, but having a problem nailing the syntax of it.
Any help is much appreciated! THANK YOU
SELECT c.competitionId, c.name, c.start_date, c.end_date, a.userid, u.name,
u.profilePic ,
SUM(activity_weight) AS totalPoints
FROM activity_entries a INNER JOIN users1 u ON u.id = a.userid
INNER JOIN competitions c ON c.competitionId = a.competitionId
WHERE c.organisationId = '$organisation' AND c.start_date < now() AND c.end_date > now()
GROUP BY a.userid, c.competitionId ORDER BY c.id DESC, totalPoints DESC
Try this query
select * from
(select
#rn:=if(#prv=competitionId , #rn+1, 1) as rId,
#prv:=competitionId as competitionId ,
totalPoints,
your_other_columns
from (select * from ...)subquery
join
(select #prv:=0, #rn:=0)tmp
order by
competitionId , totalPoints desc) a
-- only top 2 ordered by points for every competition
where rid<=2
output:
rID competitionId compName start_date end_date name totalPoints
------------------------------------------------------------
1 123 First Comp 13-09-09 13-10-09 John 100
2 123 First Comp 13-09-09 13-10-09 Bob 50
1 431 Second Comp 13-05-04 13-10-05 Sally 500
2 431 Second Comp 13-05-04 13-10-05 Jessica 50
change the last part to where rid<=1 to select top 1