SUBSTRING()

Basic Extraction Consider product codes that embed category information in specific positions. Extract to String End Practical Applications Parsing Email Domains This query finds the position of the @ symbol, adds 1 to skip past it, then extracts everything from that point to the end. The domain portion has variable length, so omitting the length parameter is essential. Fixed-Width Extraction Many legacy systems use fixed-width formats where each field occupies specific character positions: Best Practices When to Use SUBSTRING() This function is a workhorse in real-world data pipelines. SQL positions start at 1, not 0, so if you are used to zero-indexed programming languages, remember to shift your position arguments by 1 to avoid off-by-one extraction errors.