Creating a Column Based on Substring of Another Column Using `case_when` with Alternative Approaches

Conditional Insertion of Values in Hive with Join Operation

Optimizing Varying Calculations in SQLite: A Comparative Analysis of Conditional Aggregation, TOTAL(), and FILTER Clauses.

Creating Additional Rows in SQL Server Select Statements: Techniques Using CTEs and Derived Tables

Understanding the Differences Between Assignment Operators in SQL Queries

Understanding Oracle Subqueries and GROUP BY Clauses: A Key to Efficient Querying

SQL Solution to Combine Two Months of Demand Data into a Single Row with Aggregated Columns

Simplifying a SQL Case Statement in T-SQL: A Step-by-Step Guide to Reducing Complexity and Improving Performance

How to Update Rows Based on Correlated Subqueries in SQL

How to Use PSQL Query Techniques for Data Insertion with Conditions