ROUND

ROUND(f,p) returns f rounded to p decimal places.

The number of decimal places may be negative, this will round to the nearest 10 (when p is -1) or 100 (when p is -2) or 1000 (when p is -3) etc..

ROUND(2.7,0) ->  3
ROUND(2.71,1) ->  2.7

SELECT name,
       ROUND(population/1000000,1)
  FROM bbc

• FLOOR function
• MOD function
• CEIL function