Functions on Vonnghttps://vonng.com/en/tags/functions/Recent content in Functions on VonngHugo -- gohugo.ioenrh@vonng.com (Ruohang Feng)rh@vonng.com (Ruohang Feng)© 2025 Ruohang FengFri, 06 Apr 2018 00:00:00 +0000Function Volatility Classification Levelshttps://vonng.com/en/pg/sql-func-volatility/Fri, 06 Apr 2018 00:00:00 +0000rh@vonng.com (Ruohang Feng)https://vonng.com/en/pg/sql-func-volatility/PostgreSQL functions have three volatility levels by default. Proper use can significantly improve performance.