SELECT ROUND(125.315, 2);
--Result: 125.320 (result is rounded because 3rd parameter is omitted)
SELECT ROUND(125.315, 2, 0);
--Result: 125.320 (result is rounded because 3rd parameter is 0)
SELECT ROUND(125.315, 2, 1);
--Result: 125.310 (result is truncated because 3rd parameter is non-zero)
SELECT ROUND(125.315, 1);
--Result: 125.300 (result is rounded because 3rd parameter is omitted)
SELECT ROUND(125.315, 0);
--Result: 125.000 (result is rounded because 3rd parameter is omitted)
SELECT ROUND(125.315, -1);
--Result: 130.000 (result is rounded because 3rd parameter is omitted)
SELECT ROUND(125.315, -2);
--Result: 100.000 (result is rounded because 3rd parameter is omitted)
SELECT ROUND(2.5,0)
-- Result 3
SELECT ROUND(2.4,0)
-- Result 4