left-join Questions
3
Solved
3
Solved
I have a normalized database and I'm trying to return data from multiple tables using JOINs and GROUP_CONCAT.
Problem: Rows are being duplicated with GROUP_CONCAT. I can't use DISTINCT because so...
Pilferage asked 3/5, 2014 at 23:46
2
Solved
I'm writing a complex MySQL query with multiple LEFT JOINs to combine data from several different tables.
$public_query =
"SELECT * FROM `wsat_ib`
LEFT JOIN wp_usermeta ON wsat_ib.user_id = wp_u...
8
Solved
How do I change this query so it returns all u.usergroups?
from u in usergroups
from p in u.UsergroupPrices
select new UsergroupPricesList
{
UsergroupID = u.UsergroupID,
UsergroupName = u.Usergrou...
Southeaster asked 4/4, 2011 at 11:46
4
Solved
I have an array of objects in javascript (D3) and I need to remove every object of which a certain attribute is present in another array of objects attribute,
i.e. a left outer join
(source: tazin...
Daphie asked 2/3, 2015 at 12:53
3
Solved
I have two data frames that I want to join using dplyr. One is a data frame containing first names.
test_data <- data.frame(first_name = c("john", "bill", "madison", "abby", "zzz"),
stringsAsF...
3
Solved
I am getting the error subquery must return only one column when I try to run the following query:
SELECT mat.mat as mat1, sum(stx.total) as sumtotal1,
(
SELECT mat.mat as mat, sum(stx.total) as ...
Larrabee asked 29/10, 2013 at 3:28
4
I have 3 tables:
users(id, account_balance)
grocery(user_id, date, amount_paid)
fishmarket(user_id, date, amount_paid)
Both fishmarket and grocery tables may have multiple occurrences for the sa...
Fanaticize asked 17/9, 2012 at 17:7
4
Solved
So this might be more of a theoretical question about how joins in MySQL work, but I'd love some guidance.
Let's say I have three tables, table a, b and c, where table a and b are fact tables and ...
6
Solved
I was looking at a few graphs to understand the difference between the joins, and I came across this image:
Maybe the problem is in representing this with Venn Diagrams.
But looking at the first j...
7
Solved
Suppose I have the following two tables:
STUDENT
studentid lastname firstname
1 Smith John
2 Drew Nancy
STUDENT_STORY
studentid dateline storyid status
1 1328313600 10 2
1 1328313601 9 1
2 132831...
1
The join is not working. Sample data and code as follows.
Look up file:
helper time Loc FUEL Rep KM
0.1|A100|A 0.1 A100 100.00% -3.93 659
0.1|A200|A 0.1 A200 100.00% -4.49 628
0.22|A100|B 0.22 ...
5
Solved
I have 2 tables:
Table person with columns: person_id, person_name
Table pet with columns: pet_id, owner_id, pet_name
person data:
1, 'John'
2, 'Jill'
3, 'Mary'
pet data:
1, 1, 'Fluffy'
2, 1, 'Bus...
Southing asked 7/10, 2019 at 10:0
4
Solved
I have two tables: gems and gemdetail that are left joined. I am trying to limit the LEFT JOIN to 10 records in the gems table. There are 2 other tables joined (gemreply and users) as well, but the...
5
Solved
Take the case of two tables: tbl_product and tbl_transaction.
tbl_product lists product details including names and ids while tbl_transaction lists transactions involving the products and includes ...
Dolichocephalic asked 27/7, 2010 at 23:8
10
Solved
Assuming I have a left outer join as such:
from f in Foo
join b in Bar on f.Foo_Id equals b.Foo_Id into g
from result in g.DefaultIfEmpty()
select new { Foo = f, Bar = result }
How would I expre...
5
Solved
This question is somewhat related to issues Efficiently merging two data frames on a non-trivial criteria and Checking if date is between two dates in r. And the one I have posted here requesting i...
4
Solved
I have 2 dataframes:
restaurant_ids_dataframe
Data columns (total 13 columns):
business_id 4503 non-null values
categories 4503 non-null values
city 4503 non-null values
full_address 4503 non-nu...
5
Solved
Model Search :
$query = Countries::find()->joinWith(['states']);
$dataProvider = new ActiveDataProvider([
'query' => $query,
]);
$dataProvider->setSort([
'defaultOrder' => ['doc_...
8
Solved
I currently have this left join as part of a query:
LEFT JOIN movies t3 ON t1.movie_id = t3.movie_id AND t3.popularity = 0
The trouble is that if there are several movies with the same name and ...
5
Solved
I have a four tables, TopLevelParent, two mid level tables MidParentA and MidParentB, and a Child table which can have a parent of MidParentA or MidParentB (One or the other midParent must be in pl...
Crutch asked 1/11, 2013 at 10:33
2
Solved
I am doing a left non-equi join using data.table:
OUTPUT <- DT2[DT1, on=.(DOB, FORENAME, SURNAME, POSTCODE, START_DATE <= MONTH, EXPIRY_DATE >= MONTH)]
The OUTPUT contains a correct lef...
Ukase asked 31/5, 2017 at 10:18
2
Solved
I am facing a strange performance issue with a mysql query.
SELECT
`pricemaster_products`.*,
`products`.*
FROM `pricemaster_products`
LEFT JOIN `products`
ON `pricemaster_products`.`ean` = `produc...
Couch asked 6/9, 2013 at 14:32
9
Solved
I read many threads about getting only the first row of a left join, but, for some reason, this does not work for me.
Here is my structure (simplified of course)
Feeds
id | title | content
-----...
Afternoons asked 25/3, 2013 at 23:6
3
Solved
Here are two datasets: (this is fake data)
library(tidyverse)
myfruit <- tibble(fruit_name = c("apple", "pear", "banana", "cherry"),
number = c(2, 4, 6, ...
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