Calculating Development Column from Previous Two Columns in SQL Using Window Functions and Conditional Aggregation

SQL Conditional Select and Conditionals in the WHERE Clause

Filtering Large Dataframes in R Using Data.Table Package: Efficient Filtering of Cars Purchased within 180 Days

Conditional Storage of Values in a List Based on Two Columns in R Using dplyr Package

Modifying Values in a DataFrame Based on Another Column

Using Label-Based Indexing to Update Pandas Columns with Numeric Suffixes Efficiently