SQL problem - Number of Unique Subjects Taught by Each Teacher

February 17, 2024 less than 1 minute read

1 min read 40 words

Problem

Query

SELECT
    teacher_id,
    COUNT(DISTINCT subject_id) as cnt
FROM
    Teacher
GROUP BY
    teacher_id

Share on

X Facebook LinkedIn Bluesky

Using pyodbc to Insert Data from Excel or CSV to SQL Server

July 17, 2026 5 minute read

In many data engineering tasks, you often need to move data from local files like Excel or CSV into a centralized database like SQL Server. Python provides e...

Robust Automation: Downloading and Extracting NPI Files from CMS with Python

July 17, 2026 6 minute read

In the healthcare data world, the National Provider Identifier (NPI) dataset from CMS is essential. However, the files are massive, and the manual process of...

Understanding SelectList in ASP.NET Core MVC .NET 10

2 minute read

Dropdown lists are a staple of web forms. Learn how to effectively use SelectList and MultiSelectList in ASP.NET Core MVC to create dynamic, data-driven sele...

Using JavaScript in ASP.NET Core MVC .NET 10: A Complete Guide

2 minute read

Master the art of integrating JavaScript into your ASP.NET Core MVC projects. From script placement to AJAX calls with Antiforgery tokens, learn everything y...

Thomas Ngo