Using Common Table Expressions in SQL Queries: Avoiding COALESCE Data Type Incompatibility

Finding Previous Week Data Using MySQL Subqueries and Cutoff Dates

Filtering Out Duplicate Values Using SQL's IN and NOT IN Operators

Matching Specific Keywords in SQL Server Strings Without Partial Matches

Understanding and Troubleshooting Java Language Routines in HSQLDB 2.5.1: A Guide to Avoiding General Error (S1000)

Understanding SQL Inserts with Select Statements: A Guide to Avoiding "Invalid Column Name" Errors

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

Optimizing Many-to-Many Relationships with PostgreSQL's Group By Feature

Counting Users by Build and Day Using SQL and Grouped Aggregates: A Solution for Line Charting Historical Data

Understanding Case En Multi Velues Return in SQL: Effective Use of Case Expressions for Multi-Value Columns