Data update

Task/Determine-if-a-string-is-numeric/DuckDB/determine-if-a-string-is-numeric.duckdb

@@ -0,0 +1,22 @@
+CREATE OR REPLACE FUNCTION is_valid_number(s) AS
+    CASE
+        WHEN s IS NULL THEN false
+        WHEN try_cast(s AS DOUBLE) IS NOT NULL THEN true
+        ELSE false
+    END;
+
+# Illustration
+select s, is_valid_number(s) from
+   (select unnest([
+      '123.0',
+      '123.',
+       '-123',
+       '3.14159',
+       '1.2.3',
+       'abc',
+       'A440',
+       ' 12 ',
+       '0A',
+       '+1E10',
+       '1E-10'
+       ]) as s);