I can provide more insights into optimizing the Union query in SQL Server.

Fixing SQL Server Errors with Dynamic Pivot Tables Using the STUFF Function

How to Create and Manage Linked Servers in SQL Server Without the `sp_addlinkedserver` Procedure

Concatenating Distinct Values with PostgreSQL's STRING_AGG and "Distinct On

Building a Hierarchical Structure with SQL: Fetching Data from Multiple Tables

A Deep Dive into Gaps and Islands: Calculating Consecutive Days for User Activity

Using Recursive Common Table Expressions to Generate a Hierarchy in T-SQL

How to Generate Extra Records with a Given Frequency Using SQL: A Step-by-Step Guide

Aggregating Data with Complex Conditions: A Deep Dive into SQL Queries

Understanding Truncation in SQL Server: A Comprehensive Guide