diff --git a/src/postgres_mcp/sql/safe_sql.py b/src/postgres_mcp/sql/safe_sql.py
index 2aa07ee4..37382f0b 100644
--- a/src/postgres_mcp/sql/safe_sql.py
+++ b/src/postgres_mcp/sql/safe_sql.py
@@ -170,6 +170,9 @@ class SafeSqlDriver(SqlDriver):
         "trim_scale",
         "trunc",
         "width_bucket",
+        "percentile_cont",
+        "percentile_disc",
+        "mode",
         # Trigonometric functions
         "acos",
         "acosd",