I have two "tables" such as:
PEOPLE (ID / NAME)
1 | JOHN
2 | MARY
3 | PETER
MESSAGES (ID / PERSON_ID / TEXT)
1 | 1 | 'Text'
1 | 1 | 'Text 2'
1 | 2 | 'Text 3'
1 | 3 | 'Text 4'
How can I get the number of messages of each person? Just like:
(PERSON_ID / NAME / MESSAGES)
1 | JOHN | 2
2 | MARY | 1
3 | PETER | 1
this should do the trick:
r.db("so").table("messages")
.group(r.row('person_id')).count().ungroup()
.map((result) => {
return result.merge(r.db("so").table("users").get(result('group')));
})
Result looks like this:
[
{"group":1,"id":1,"name":"Dalan","reduction":2},
{"group":2,"id":2,"name":"Rodger","reduction":3}
]
You can further rename the fields as you like with the .merge method but this gets you the join and grouping that you wanted!
Let me know if you have any questions.
Related
I have SQL query which I need to convert to Eloquent and no idea where to write MAX conditions. How it is posible to convert it without much Raw sql? Thank you!
SELECT bike_id
FROM bike_filters
GROUP BY bike_id
HAVING
MAX(bike_category_id in (416,11111)) = 1
AND MAX(bike_category_id in (5555,779)) = 1
AND MAX(bike_category_id in (5555,772)) = 1
Table Structure:
| id | bike_id | bike_category_id |
| 1 | 3 | 416 |
| 2 | 3 | 779 |
| 3 | 3 | 344 |
| 4 | 3 | 332 |
| 5 | 4 | 444 |
| 5 | 5 | 555 |
The purpose of this query is to get bike_ids, which has all parameters by the query - bike can have 20 filters, but if user searches by 5 and bike matches them, we get bike_id by this query.
For this you could use havingRaw() which would look something like:
$query = DB::table('bike_filters')
->select('bike_id')
->groupBy('bike_id')
->havingRaw('MAX(bike_category_id in (416,11111)) = 1')
->havingRaw('MAX(bike_category_id in (5555,779)) = 1')
->havingRaw('MAX(bike_category_id in (5555,772)) = 1')
->get();
User table
id | name | user_type | email | password
1 | John | 1 | john#gmail.com | something
2 | Roy | 1 | roy#gmail.com | something
3 | Rax | 1 | Rax#gmail.com | something
4 | Ren | 1 | ren#gmail.com | something
AssignUser Table
id | user_id | assign_to_math | assign_to_chemistry
1 | 3 | 2 | 1
2 | 4 | 1 | 2
So, here is users table where four users are avail
Now in assign table first row Rax is assign tuitoin for math to Roy and chemistry to John
I want to get the detail of john and roy with relation
I tried in User models
public function getInfoFormathTutor(){
return $this->hasOne('App\AssignUser', 'id', 'assign_to_math');
}
It return for me null value don't know why please help
Thanks in advance
try:
public function getInfoFormathTutor(){
return $this->hasOne('App\AssignUser', 'assign_to_math', 'id');
}
I have a table that I am trying to figure out how to pivot and sum based on the values in a second column.
Example input:
|own|pet|qty|
|---|---|---|
|bob|dog| 2 |
|bob|dog| 3 |
|bob|dog| 1 |
|bob|cat| 1 |
|jon|dog| 1 |
|jon|cat| 1 |
|jon|cat| 1 |
|jon|cow| 4 |
|sam|dog| 3 |
|sam|cow| 1 |
|sam|cow| 2 |
Example output:
|own|dog|cat|cow|
|---|---|---|---|
|bob| 6 | 1 | |
|jon| 1 | 2 | 4 |
|sam| 1 | | 3 |
Use case and sum():
select own, sum(case when pet='dog' then qty end) as dog,
sum(case when pet='cat' then qty end) as cat,
sum(case when pet='cow' then qty end) as cow
from your_table
group by own;
For dynamic data you can use MAP
select own
,str_to_map(concat_ws(',',collect_list(concat(pet,':',cast(qty as string))))) as pet_qty
from (select own,pet
,sum(qty) qty
from mytable
group by own,pet
) t
group by own
;
+-----+---------------------------------+
| own | pet_qty |
+-----+---------------------------------+
| bob | {"cat":"1","dog":"6"} |
| jon | {"cat":"2","cow":"4","dog":"1"} |
| sam | {"cow":"3","dog":"3"} |
+-----+---------------------------------+
In stata if I have a list if groups:
XYZ
ABC
ABC
BCH
JSA
BCH
XYZ
How I get each group to have a unique ID in a second column after sorting, for example:
ABC 1
BCH 2
JSA 3
XYZ 4
You need sort, then group(), which is part of egen.
sysuse auto,clear
sort make
egen make_gp = group(make)
This yields:
. list make make_gp in 1/5
+-------------------------+
| make make_gp |
|-------------------------|
1. | AMC Concord 1 |
2. | AMC Pacer 2 |
3. | AMC Spirit 3 |
4. | Buick Century 7 |
5. | Buick Electra 8 |
+-------------------------+
This is a bit hard to explain in words ... I'm trying to calculate a sum of grouped distinct values in a matrix. Let's say I have the following data returned by a SQL query:
------------------------------------------------
| Group | ParentID | ChildID | ParentProdCount |
| A | 1 | 1 | 2 |
| A | 1 | 2 | 2 |
| A | 1 | 3 | 2 |
| A | 1 | 4 | 2 |
| A | 2 | 5 | 3 |
| A | 2 | 6 | 3 |
| A | 2 | 7 | 3 |
| A | 2 | 8 | 3 |
| B | 3 | 9 | 1 |
| B | 3 | 10 | 1 |
| B | 3 | 11 | 1 |
------------------------------------------------
There's some other data in the query, but it's irrelevant. ParentProdCount is specific to the ParentID.
Now, I have a matrix in the MS Report Designer in which I'm trying to calculate a sum for ParentProdCount (grouped by "Group"). If I just add the expression
=Sum(Fields!ParentProdCount.Value)
I get a result 20 for Group A and 3 for Group B, which is incorrect. The correct values should be 5 for group A and 1 for group B. This wouldn't happen if there wasn't ChildID involved, but I have to use some other child-specific data in the same matrix.
I tried to nest FIRST() and SUM() aggregate functions but apparently it's not possible to have nested aggregation functions, even when they have scopes defined.
I'm pretty sure there is some way to calculate the grouped distinct sum without needing to create another SQL query. Anyone got an idea how to do that?
Ok I got this sorted out by adding a ROW_NUMBER() function my SQL query:
SELECT Group, ParentID, ROW_NUMBER() OVER (PARTITION BY ParentID ORDER BY ChildID ASC) AS Position, ChildID, ParentProdCount FROM Table
and then I replaced the SSRS SUM function with
=SUM(IIF(Position = 1, ParentProdCount.Value, 0))
Put a grouping over the ParentID and use a summation over that group,
eg:
if group over ParentID = "ParentIDGroup"
then
column sum of ParentPrdCount = SUM(Fields!ParentProdCount.Value,"ParentIDGroup")