join Questions
2
In the R programming language, I am interested in performing a "fuzzy join" and passing this through a SQL Connection:
library(fuzzyjoin)
library(dplyr)
library(RODBC)
library(sqldf)
co...
13
Solved
I want to update a column in a table making a join on other table e.g.:
UPDATE table1 a
INNER JOIN table2 b ON a.commonfield = b.[common field]
SET a.CalculatedColumn= b.[Calculated Column]
WHER...
Lexie asked 21/10, 2009 at 22:48
3
Solved
Assume I have following tables:
table: followers_arrays
id | array
--------+---------
1 | {3,4,5}
table: small_profiles
id | username | pic
--------+----------+-------
3 | aaaa | abcd
4 ...
Wertheimer asked 1/11, 2015 at 20:25
5
I want to join more than two collections in MongoDB using the aggregate $lookup. Is it possible to join? Give me some examples.
Here I have three collections:
users:
{
"_id" : ObjectId("5684f3...
Licentious asked 5/3, 2016 at 12:2
6
Solved
Let's say I have three tables A, B, and C. Each has two columns: a primary key and some other piece of data. They each have the same number of rows. If I JOIN A and B on the primary key, I should e...
2
Solved
I want to join 2 dataframes and I'm using the intructions in the Julia guide:
http://dataframesjl.readthedocs.org/en/latest/joins_and_indexing.html?highlight=join
join(a, b, on = :ID, kind = :inne...
Languid asked 21/12, 2014 at 21:37
3
Solved
I have two tables, books, and chapters. One book has many chapters.
Book model:
public function chapters() {
return $this->hasMany(Chapter::class);
}
Chapter model:
public function book() ...
Dissertation asked 25/4, 2017 at 2:39
5
Solved
I have two tables, one is for news and the other one is for comments and I want to get the count of the comments whose status has been set as approved.
SELECT
ccc_news . *,
count(if(ccc_news_co...
Intradermal asked 21/3, 2012 at 5:11
6
Solved
I'm frequently using pandas for merge (join) by using a range condition.
For instance if there are 2 dataframes:
A (A_id, A_value)
B (B_id,B_low, B_high, B_name)
which are big and approximately...
2
Solved
Update: the root issue was a bug which was fixed in Spark 3.2.0.
Input df structures are identic in both runs, but outputs are different. Only the second run returns desired result (df6). I know I...
Glassine asked 24/9, 2021 at 13:58
6
Solved
I have 2 tables and i am using join to get common records from those 2 tables. i have used the following query but my problem is i am getting the records doubled. The query is as follows
SELECT * ...
3
I have two tables, Project and Projectnote
There is a one to many relationship between project and projectnote.
I want to be able to list my projects and select the most recent projectnotes based...
1
Solved
I'm very new to jq and this post is a result of not understanding the mechanics behind jq.
I could develop a bash script, which does what I want but jq and it's JSON super-powers have intrigued me ...
2
Assume I have 2 dataframes. I want to add a column of dataframe 1 to dataframe 2 based on a column lookup. If the join is not possible, I want in the extra column a certain constant (so I can filte...
7
Solved
I want to know if a user has an entry in any of 2 related tables.
Tables
USER (user_id)
EMPLOYEE (id, user_id)
STUDENT (id, user_id)
A User may have an employee and/or student entry. How can I get...
Smokeproof asked 23/4, 2012 at 10:49
3
Solved
I use CodeIgniter for my project and this is my code in model
public function group_all_ville(){
$this->db->select('*');
$this->db->from('departement');
$this->db->join...
Rigdon asked 4/1, 2017 at 20:54
3
Solved
I have the following SQL (PostgreSQL) query:
SELECT ff.*, fp.*
FROM fibra ff, fibra fp
JOIN cables cp ON fp.cable_id = cp.id
LEFT OUTER JOIN terceiro ced_pai ON ced_pai.id = cp.cedente_id
LEFT OU...
Spat asked 8/11, 2012 at 20:43
20
Solved
I am an old-school MySQL user and have always preferred JOIN over sub-query. But nowadays everyone uses sub-query, and I hate it; I don't know why.
I lack the theoretical knowledge to judge for m...
13
Solved
Suppose I have a table of customers and a table of purchases. Each purchase belongs to one customer. I want to get a list of all customers along with their last purchase in one SELECT statement. Wh...
Garwin asked 21/1, 2010 at 17:29
3
Solved
I am getting some basic invoice information in a SQL query and figuring the Order Total and Payment Totals in the same query. Here is what I have thus far:
SELECT
orders.billerID,
orders.invoic...
2
I have the following (simplified) situation:
Fields for TABLE A:
ID
COMMONID
Fields for TABLE AB:
AID
BID
COMMONID
Fields for TABLE B:
ID
COMMONID
and want to map it with entities usin...
10
Solved
I have two tables, table1 and table2. Each with the same columns:
key, c1, c2, c3
I want to check to see if these tables are equal to eachother (they have the same rows). So far I have these two...
6
I am joining two big datasets using Spark RDD. One dataset is very much skewed so few of the executor tasks taking a long time to finish the job. How can I solve this scenario?
Monoxide asked 2/11, 2016 at 6:18
3
Solved
I have the following HQL
String FIND_PRODUCT_CLASS_ID = "SELECT pc.id FROM ProductClass pc"+
" JOIN ProductGroup pg ON pc.id = pg.productClassId" +
" JOIN Product p ON pg.id = p.id" +
" JOIN Pro...
5
Solved
I have two tables in database:
CREATE TABLE items(
id SERIAL PRIMARY KEY,
... some other fields
);
This table contains come data row with unique ID.
CREATE TABLE some_chosen_data_in_order(
i...
Detector asked 21/3, 2010 at 10:36
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