Concurrency With Select, Goroutines, and Channels | by Yair Fernando | Jun, 2022

Master concurrency in Go Image by author In this article, we are going to talk about how to build concurrent programs combining select, goroutines, and channels in Golang. I’d recommend reading these two articles first to get familiar with the concepts of concurrency, channels, and goroutines. From the Go tour documentation: “The select statement lets … Read more

java – Spring Cassandra time out query ‘SELECT * FROM system_schema.tables’ timed out after PT2S

I am using Spring Boot 2.4.4 and Spring Data Cassandra dependency to connect to the Cassandra database. During the application startup, I am getting a DriverTimeout error (I am using VPN). I have gone through all the Stack Overflow questions similar to this and none of them worked for me. I have cross-posted the same … Read more

Learning Python With Program Templates: Select From Alternatives (Part 1) | by Mike McMillan | May, 2022

A fun way to create a flexible program Photo by Alex Kotliarskyi on Unsplash In this article, I’m going to introduce the Select From Alternatives program template. This template provides the programmer with a process for making decisions in their programmes. The template is implemented using Python’s if statement. Many programming languages ​​also provide the … Read more

javascript – React JS – Updating subcomponent select element dropdown’s selected value from another subcomponent navigation control’s driven state change

I stopped trying to bang my head against the wall and decided to post my question as I am in need of help to revolve why I can not update the select drop down on page navigation action (first, previous, next, last) for a set of records. My desired behavior in react will be to … Read more

How to Select Date From Datepicker in Selenium Webdriver Using Java

Selenium is a widely used automation testing tool used to ensure the seamless working of web applications in accordance with predetermined technical and business requirements. Using Selenium is a great way to comply with the growing demands made upon developers and testers – faster and more efficient release of new and updated features, ideally within … Read more

c# – npgsql: How to select multiple rows (with multiple column values) with npgsql in one command with a collection as a parameter?

I have two tables defined below, supplier_balances and supplier_balance_items (btw there is a 1[supplier_balance]:N[supplier_balance_items] relationship between the two): CREATE TABLE IF NOT EXISTS sch_brand_payment_data_lake_proxy.supplier_balances ( /* id is here for joining purposes with items table, instead of joining with the 4 columns used for sake of making sure a record is deemed as unique */ … Read more

Select random records for each users using SQL server in efficient way

I have used the below query to select 5 random records for each shopperId and it is working fine but it is taking time to execute for large number of records (more than 100k records). So is there any way to improve the performance over large amount of data? SELECT * FROM (SELECT ROW_NUMBER() OVER … Read more

sql – I need to optimize the following pgsql select statement – its currently taking 34 avg seconds to execute

I have a view that shows all relations. I use the following select for the view: CREATE VIEW relationships AS SELECT DISTINCT relations.name, sch_tco.id AS table_id, relations.related_table AS related_table, scd_tco.id AS related_id, relations.foreign_column AS foreign_column_name, relations.local_column AS local_column_name, count(DISTINCT relations.name) AS relationships, count(DISTINCT relations.referenced_tables) AS foreign_keys_count, count(DISTINCT relations.referencing_tables) AS references_count, count(DISTINCT related_table) AS related_tables_count, count(DISTINCT … Read more