I'm using laravel 4.2 and I have the following table that looks like this
ID|chosen(boolean('0','1'))|subject|user_id
1|1 |cricket|2
2|0 |cricket|3
3|1 |rugby |2
I would like to choose the user_id that has the most chosen rows or in other words the user that has the most 1s in their chosen column. So in this case user 2 would be the correct result.
I believe this is the answer
$table = DB::table('tablename')
->select(array(DB::raw('count(user_id) AS CountUser')))
->where('chosen', 1)
->orderBy('CountUser', 'desc')
->groupBy('user_id')
->first();
however how do I display the user_id in my view? For example:
{{$table->user_id}} //should give me '2'
Error message reads:
Undefined property: stdClass::$user_id
You are selecting the count only. Try this
$table = DB::table('tablename')
->select(DB::raw('count(user_id) AS CountUser, user_id'))
->where('chosen', 1)
->orderBy('CountUser', 'desc')
->groupBy('user_id')
->first();
Related
In my back-end I'm using KnexJS with PostgreSQL and I have to build a Knex function using its SQL builder without the raw SQL.
It is the first time for me to use KnexJS and I got few issues.
What I have to build is as shown in the SQL example
UPDATE
feed
SET
status = 'SOME_STATUS'
WHERE
created_at <= 'SOME_TIMESTAMP'
AND conversation_id = 'ID';
This SQL is updating the table feed all columns with status and where two conditions are met.
In Knex what I tried as example code of my idea
answerPendingMessages(feeds) {
return this.tx(tableName).where({
conversationId,
createdAt <= timestamp // This not idea how to do in Knex ???
}).update({
status: 'ANSWERED'
})
}
In this above function my concern is how to actually convert the where part as one of the consitions is createdAt <= 'TIMESTAMP'
I understood that I can use where with an object but cannot understand how to include the <=
Also I should update the updatedAt column with the new timestamp but also that blocked me at the moment.
Te result in the end should that all columns which met the conditions are updated status to some some status and also a new updatedAt timestamp.
I'm not sure if there is a specific way with Knex to do so
This answer is to provide my goal for my previous question.
The script I'm showing is not doing anything and I don't know know to make it to work.
answerPendingMessages(feeds) {
if (isEmpty(feeds)) return Promise.resolve([]);
const { conversationId, createdAt } = feeds;
return this.tx(tableName)
.where(
columns.conversationId === conversationId,
columns.createdAt <= createdAt
)
.update({
[columns.status]: 'ANSWERED',
[columns.updatedAt]: new Date(),
});
}
What should happen here is that to update a table where I have two conditions but one of then is 'smaller than or equals' relation.
As the output of this should be that all rows where the 2 conditions are met are update status column.
Right now the script is not failing either success piratically nothing is happening.
I have a scores table that I have to group by the attempt_number and take the sum of scores
I want to nest this query using Eloquent and SQL raw and take the Max score from the attempts and order it according to score. I need the final result as a leaderboard.
$usersByScore = Attempt::where('game_id',$id)
->select('user_id','attempt_no','game_id',DB::raw('SUM(score) as total_score'))
->groupBy('attempt_no')
->orderBy('total_score', 'DESC')
->get()
this gives me the leaderboard but it has all attempts from the user. I need just the max score attempt for each user ordered by the score in descending order.
use distinct() method for this: i hope it will work.
$usersByScore = Attempt::where('game_id',$id)
->select('user_id','attempt_no','game_id',DB::raw('SUM(score) as total_score'))
->groupBy('attempt_no')
->orderBy('total_score', 'DESC')
->distict()
->get()
Got the solution - Implemented the from method to nest the query
$usersByScore = Attempt::with('user')
->select(DB::raw('MAX(tscore) as total_score, user_id,attempt_no'))
->from(DB::raw('(SELECT user_id,attempt_no,SUM(score) as tscore FROM
attempts WHERE game_id = '.$id.' GROUP By attempt_no,user_id) AS T'))
->groupBy('user_id')
->get();
I want to get the User ID and it's average score from every minimum timestamp for each category. Here's the table structure
Skill Table
id | user_id | category | score | timestamp**
0....10............a................11........12
1....10............a................10........9
2....10............b................12........10
3....10............c................11........8
4....11............a................8........9
5....11............b................9........10
6....11............c................10........8
7....11............c................15........14
I want to get the result like this:
user_id | AVG(score)
10........11 (average id: 1,2,3)
11........9 (average id: 4,5,6)
For now I use the looping query for every user
foreach ($userIds as $id){
// in some case I need to get from only specified Ids not all of them
foreach ($category as $cat) {
// get the minimum timestamp's score for each category
$rawCategory = Skill::where("user_id", $id)->where("timestamp", "<=", $start)->where("category",$cat->id)->orderBy("timestamp", "desc")->first();
if($rawCategory){
$skillCategory[$cat->cat_name] = $rawCategory->score;
}
}
//get the average score
$average = array_sum($skillCategory) / count($skillCategory);
}
I want to create better Eloquent query to get the data like this with good performance (< 60 sec). Have anyone faced a similar problem and solved it? If so, can you please give me the link. Thanks
I have an Event model, that has user_id inside it. I want to select all objects of this model, with specified user_id but not including specific events. So I can do it with a query like that:
Event.where(user_id: user.id).where.not(id: id)
But can I combine these 2 where functions into one?
I know that if I need to find, for example, events with specified ids and user_ids, I can do it this way:
Event.where(user_id: user_id).where(id: id)
and I can compact it using one where call instead of two:
Event.where(user_id: user_id, id: id)
but can I do the same thing if I am using where and where.not?
You can gather
Event.where(user_id: 1) + Event.where.not(id: 2)
or deny a parameter
Event.where(user_id: 1).where.not(id: 2)
You can write as per below to add where and where.not :
Event.where(
"user_id = ? AND id != ?",
user.id,
id
)
so if user_id = 1 and id = 2
than this will return records with user_id 1 and without id 2 :)
try this,you can create two scopes and calling then in chain
scope :with_user, ->(user) {user_id: user.id}
scope :excluded_event, ->(event_ids) { where.not(id: event_ids) }
Event.with_user(user).excluded_event(event_ids)
I am using flask-sqlalchemy together with a sqlite database. I try to get all votes below date1
sub_query = models.VoteList.query.filter(models.VoteList.vote_datetime < date1)
sub_query = sub_query.filter(models.VoteList.group_id == selected_group.id)
sub_query = sub_query.filter(models.VoteList.user_id == g.user.id)
sub_query = sub_query.subquery()
old_votes = models.Papers.query.join(sub_query, sub_query.c.arxiv_id == models.Papers.arxiv_id).paginate(1, 4, False)
where the database model for VoteList looks like this
class VoteList(db.Model):
id = db.Column(db.Integer, primary_key=True)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
group_id = db.Column(db.Integer, db.ForeignKey('groups.id'))
arxiv_id = db.Column(db.String(1000), db.ForeignKey('papers.arxiv_id'))
vote_datetime = db.Column(db.DateTime)
group = db.relationship("Groups", backref=db.backref('vote_list', lazy='dynamic'))
user = db.relationship("User", backref=db.backref('votes', lazy='dynamic'), foreign_keys=[user_id])
def __repr__(self):
return '<VoteList %r>' % (self.id)
I made sure that the 'old_votes' selection above has 20 elements. If I use .all() instead of .paginate() I get the expected 20 result?
Since I used a max results value of 4 in the example above I would expect that old_votes.items has 4 elements. But it has only 2? If I increase the max results value the number of elements also increases, but it is always below the max result value? Paginate seems to mess up something here?
any ideas?
thanks
carl
EDIT
I noticed that it works fine if I apply the paginate() function on add_columns(). So if I add (for no good reason) a column with
old_votes = models.Papers.query.join(sub_query, sub_query.c.arxiv_id == models.Papers.arxiv_id)
old_votes = old_votes.add_columns(sub_query.c.vote_datetime).paginate(page, VOTES_PER_PAGE, False)
it works fine? But since I don't need that column it would still be interesting to know what goes wrong with my example above?
Looks to me that for the 4 rows returned (and filtered) by the query, there are 4 rows representing 4 different rows of the VoteList table, but they refer/link/belong to only 2 different Papers models. When model instances are created, duplicates are filtered out, and therefore you get less rows. When you add a column from a subquery, the results are tuples of (Papers, vote_datetime), and in this case no duplicates are removed.
I encountered the same issue and I applied van's answer but it did not work. However I agree with van's explanation so I added .distinct() to the query like this:
old_votes = models.Papers.query.distinct().join(sub_query, sub_query.c.arxiv_id == models.Papers.arxiv_id).paginate(1, 4, False)
It worked as I expected.