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Selecting Data with Count on Three Tables: A Step-by-Step Guide to Efficient SQL Queries

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Advanced Data Manipulation with R: Selecting Columns Based on Patterns in a data.table Using Regular Expressions

Count Rows from a Single Table Based on Multiple Conditions Using SQL: A Step-by-Step Guide to Efficient Solutions

Selecting IDs Based on Conditional Matching in R: A Step-by-Step Guide

Understanding SQL JOINs: A Comprehensive Guide to Categorizing Results Based on Conditions

Understanding Many-To-Many Relationships in SQL for Efficient Data Management