SELECT FORMAT(1.234,0,'en_US');
SELECT FORMAT(1.234,1,'en_US');
SELECT FORMAT(1.234,2,'en_US');
SELECT FORMAT(1.234,3,'en_US');
SELECT FORMAT(1.234,4,'en_US');
SELECT FORMAT(1.234e-2,4,'en_US');
SELECT FORMAT(-1.234,4,'en_US');

WITH RECURSIVE cte(n) AS (
	SELECT 1 n
	UNION ALL
	SELECT 100+n FROM cte WHERE n<1000
)
SELECT FORMAT(n+0.01,3,'foo_bar') FROM cte;
SHOW WARNINGS;