I am exploring the how indexes work under the hood. After going through some resources what I understood was ordering of indexes do matter in sql databases. But, I am confused of Nosql databases(Mongodb) After going through some resources, they mention it doesn’t matter. But I am confused how and why it doesn’t matter. Kindly

Im working on a project which has these two tables: leagues and teams Each league can have many teams and a team can compete in many leagues. Initially, I was going to create a join table league-teams; however, I don’t find it necessary to create a new join table. We are talking about 1500 football

I have an old tool that I’m trying to update to a new data source. Everything on the tool seems to be working other than when I try to update specific records based on a load number. Now, this column changed from a NUMBER format, to now a STRING format. That is the only difference.

I have the following ibatis query which I want to migrate from Oracle to PostgreSQL with Hibernate. BEGIN INSERT INTO users( user_id, personal_id, created_by, modified_by ) VALUES ( #{user_id}, #{personal_id}, <choose> <when test="userCred == true">'profile'</when> <otherwise>'basic'</otherwise> </choose>, <choose> <when test="userCred == true">'profile'</when> <otherwise>'basic'</otherwise> </choose> ); EXCEPTION WHEN HIST_INDEX THEN UPDATE .......... END; void insert(@Param("user_id") long

I need to select values from one column, that have duplicates, but exclude values, that also have duplicates in other column. Working with SQLite. Need query to be reasonably optimal. Example table: file checksum 2 1 3 1 4 2 4 2 5 3 5 3 6 3 SQL: CREATE TABLE t1 ( file INT,

I’m using Databricks with two different clusters (one from older version and one from new) to run a query that aggregates names, emails, and phone numbers from two data sources using COLLECT_SET. The goal is to combine these values into a single result per location. However, while the actual data is the same, the order

As the title describes I want to have a zero-or-one to zero-or-one relationship. For example, let’s say we have two tables Calls and Files. A call might have an attached file on it, and vice versa. But I have a restriction. I want if I delete a call, its file be deleted too, but if

I am trying to run a SQL script from within a shell script to be used in a Jenkins pipeline in order to automate updates to my database schema. I am mostly trying to run ALTER TABLE commands that are saved in SQL files in a Git repository. The shell script searches all .sql files

I have a QuestDB table in which I get a few records every second. I am aggregating in 1 minute intervals, as in select timestamp, symbol, avg(price) as price from trades where timestamp in yesterday() and side="buy" sample by 1m Now I would like to get, for every sampled row, which was the minimum value

I now how to create the procedure but do not know how to call the procedure this is what I have done. Created the procedure : CREATE PROCEDURE SelectAllCustomers AS SELECT * FROM Customers GO; I have created it but next thing how to call the procedure, directly in the SQL console? You need to