Category "join"

SQL using table from join in subqueries

I am writing a query to be used as databases view, it looks now like this: SELECT contact.*, contact_users.names AS user_names, contact_status.status_

Rationale of Rails 5 Join Table Generated Defaults

The Rails 5 command rails g migration create_foo_bar_join_table generates the following migration: class CreateFooBarJoinTable < ActiveRecord::Migration[5.0]

compare two tables having same column name but different date column names

I have table A id1 dt x1 2022-04-10 a2 2022-04-10 a1 2022-04-10 x1 2022-05-10 x2 2022-04-10 y2 2022-04-10 y1 2022-05-10 x1 2022-06 -10 Table B id1 dt a1 2022

How to do a Join and a Loop corectly using R

I have two sets of data that have a column mean_wage in common, but they are described differently. First one as 1 (wage), 2, 2.4 ... and the other one as 1256.

Join two dataframes using the closest timestamp pyspark

So I am very new to pyspark but I am still unable to correctly create my own query. I try googling my problems but I just don't understand how most of this work

Joining two tables and getting values

I have two config tables. The structure is as below: Table 1: Client_Config id, name, value, type, description Table 2: App_Config name, value, type, descript

ORA-22806 (not an object or REF) on Join to a view

Here is a fairly simple query that is throwing this error: SELECT RR.REQUEST_ID FROM CCS_REQUEST_RESPONSE RR INNER JOIN VW_STUDENT_CURRENT_AND_HIST VW ON RR.S

data.table join with date

hello im trying to extract some id with a group and Date in range > d1 id group Date 1: 1 A 2017-07-02 2: 2 A 2017-07-04 3: 3 A

Postgres Subquery - How to create ALIAS in object format from subqueries

I am trying to wrap several queries into 1 complex query. Here is the scenario. Given a user_id of 'xxxxx-xx-xxxxx' I have to query for several data points with

How to select all fields from one table that contain a substring from any row in another column

I'm trying to export a dictionary of words in sqlite made up only of words that start with, contain, or end with specific filters. If one filter was 'ment' and

pandas: merge (join) two data frames on multiple columns

I am trying to join two pandas data frames using two columns: new_df = pd.merge(A_df, B_df, how='left', left_on='[A_c1,c2]', right_on = '[B_c1,c2]') but got

Using SQL to join tables with a junction table

I am trying to output data from 2 different tables in my database which are joined by a junction table. Table 1: musician Columns: musicianID, surname, fName

How can I delete rows from table A and table B if rows in table B don't exist

I have 2 tables and I need to delete rows from both tables if A.itemID does not exist in table B I've tried doing : DELETE a,b FROM A a, B b WHERE NOT E

SQL placement join with student, friend, package

Issue: You are given three tables: Students, Friends and Packages. Students contains two columns: ID and Name. Friends contains two columns: ID and Friend_ID

Join the same table temporary table in MySQL

I like to join a temporary table in MySQL which fails, the idea quite simple: CREATE TEMPORARY TABLE temp_table LIKE any_other_table; -- srsly it does not matt

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