User-defined functions let you wrap a calculation once, give it a name, and call it across every query instead of retyping the logic. This cheatsheet puts the whole syntax on one page: scalar SQL functions, JavaScript functions, conditional logic, JSON parsing, persistent functions, and table functions. Every snippet is annotated line by line, so you can copy a pattern and understand exactly what each part does. Keep it open in a second tab while you work, or save the image and pin it somewhere handy.
Download the cheatsheet
The full cheatsheet is available as a single image you can save, print, or drop into your team’s wiki. It carries every snippet below with its line-by-line notes.
If you want the background behind any of these patterns, start with the full guide to user-defined functions in BigQuery. When you want to run them, work through the 10 code-along examples.
See you soon, Andrei.
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