Unlike simpler tools that rely solely on UNION queries, Havij 1.19 employs a multi-vector approach:
Havij (which means "carrot" in Persian, though the name is likely a play on the tool’s "root vegetable" harvesting of data) is an automated SQL Injection tool. Version 1.19 is widely considered the most stable, feature-complete, and leaked version of the original software developed by ITSecTeam. Havij - Advanced SQL Injection 1.19