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Questions - join

Joining and combining two tables that have the same ID for different rows

In SQLite I have two tables, tab_a and tab_b. Both have some similar columns and some that differ: tab_a -> id | utc | name | data_1 | data_2 | data_3 tab_b -> id | utc | name | data_x | data_y ...
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Matthias

sql

sqlite

join

Votes: 0

Answers: 1

Latest Answer

You have to use UNION, not JOIN for your purposes like this: CREATE TABLE tab_a ( id int PRIMARY KEY, utc text, name text ); CREATE TABLE tab_b ( id int PRIMARY KEY, utc text, ...
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Oleksii Tambovtsev

How to join two tables with ActiveRecord methods in CodeIgniter 4?

I have some data submitted into db_table(e.g lodge), some of which are id_no from another table(e.g room_type). When I try to fetch data from the db_table(lodge) to my view which comes in array, it re...
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Anonymous

php

codeigniter

join

Votes: 0

Answers: 0

How to return the count of a column in the second table of the join along with other columns

I am working on a MySQL project that involves writing very complex MySQL queries. Now I have a problem trying to get the count of a specific column which value is not null of the second table in the L...
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Wai Yan Hein

mysql

join

Votes: 0

Answers: 1

Latest Answer

Try using the OVER() clause. This will allow a count without a GROUP BY. https://learnsql.com/blog/over-clause-mysql/ COUNT(ta.ID) OVER() Kathi
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Kathi Kellenberger

R - inserting aggregate results into a data.frame

To produce a cumulative plot using ggplot2 geom_stat(), I need a data.frame() that has the number of instances of various combinations of factors. I know how to produce the numbers using aggregate(),...
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Bill Pearson

r

dataframe

join

merge

Votes: 0

Answers: 0

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