ASOF joins are a powerful tool when dealing with time-series data. They match each record from one table with the nearest—but not necessarily equal—value from another table based on a chosen column, typically used in financial data or sensor readings where timestamps might not align perfectly by millisecond. PostgreSQL does not directly support ASOF joins but can achieve similar functionality using sub-select join operations along with conditions to match rows based on criteria. When using Timescale, the query benefits from the Skip Scan feature, which can supercharge performance and provide an 8,000x speed-up.