Update a column with a COUNT of other fields is SQL?
update articles set num_comments = (select count (*) from comments where comments.article_id = articles.id) This will update the entire articles table, which may not be what you want. If you …
The COUNT Function in SELECT statement - Laracasts
Hello, i have two tables named "article" and "comment". So, i want to select some information about all articles and the comment's count for each article especially.
SQL SELECT COUNT() - GeeksforGeeks
Jul 23, 2025 · This article provides a detailed explanation of SELECT and COUNT () in SQL, including syntax, examples, and practical use cases. Whether we’re filtering rows, counting …
The SQL COUNT() Function: A Detailed Guide - LearnSQL.com
Mar 16, 2023 · To count unique (non-duplicate) values in a certain column, you put the DISTINCT keyword inside COUNT(), followed by the name of the column. With this syntax, the function …
SQL SELECT statement with COUNT() function - DigitalOcean
Aug 3, 2022 · You can use the SQL SELECT statement with the COUNT () function to select and display the count of rows in a table of a database. Along with this, we can club SQL SELECT …
count () (aggregation function) - Kusto | Microsoft Learn
Feb 5, 2025 · Learn how to use the count () function to count the number of records in a group.
MySQL: How to count the number of rows by a condition
Jan 25, 2024 · Mastering the COUNT() function along with various conditions and clauses is essential for data manipulation in MySQL. In this tutorial, we looked over how to perform this …
SQL COUNT with CASE WHEN: Conditional Counting Explained
Oct 7, 2025 · Learn how to use SQL COUNT with CASE WHEN for conditional counts. Includes examples, interview prep tips, and common pitfalls.
COUNT OVER PARTITION BY: An Explanation with 3 Examples
Sep 7, 2023 · In SQL, combining the COUNT () function with the OVER () clause and PARTITION BY opens the door to a totally different way to count rows. In this article, you’ll learn how to do …
SQL query for finding records where count > 1 - Intellipaat
Aug 8, 2025 · Learn how to write SQL queries to find records where the count is greater than 1. Imrove your data filtering with this useful query technique.