How to Sum Columns from Two Tables with Conditions Using SQL Server

Implementing Event-Driven Architecture in WCF Applications Without Polling Database Changes

Understanding SQL and Its Limitations with Primary Key/Foreign Key Relationships: A Step-by-Step Guide to Correctly Inserting Data from One Table into Another

Retrieving Two Transactions with the Same Customer Smartcard Within a Limited Time Range in Microsoft SQL Server

Understanding SQL Joins: Why They May Not Always Give You the Correct Totals

Mastering Conditional Aggregates in SQL Server: A Comprehensive Guide to Calculating Percentages

Removing Redundant Joins and Using String Aggregation: A Solution to Concatenating Product Names for Each Client

How Databases Handle Conditional Logic in Sorting Queries

Understanding How to Execute SQL Scripts from Batch Files Using sqlcmd Commands

Understanding Address Validation in SQL: A Comprehensive Approach