FLOOR()

函数说明

FLOOR()函数返回不大于某个数字的相应数位的数。

函数语法

  1. > FLOOR(number, decimals)
  2. > FLOOR(number)

参数释义

参数说明
number必要参数，任何当前支持的数值数据
decimals可选参数，代表小数点后的位数。默认值为0，代表四舍五入为整数，当为负数时四舍五入到小数点前的数位。

示例

  1. > drop table if exists t1;
  2. > create table t1(a int ,b float);
  3. > insert into t1 values(1,0.5);
  4. > insert into t1 values(2,0.499);
  5. > insert into t1 values(3,0.501);
  6. > insert into t1 values(4,20.5);
  7. > insert into t1 values(5,20.499);
  8. > insert into t1 values(6,13.500);
  9. > insert into t1 values(7,-0.500);
  10. > insert into t1 values(8,-0.499);
  11. > insert into t1 values(9,-0.501);
  12. > insert into t1 values(10,-20.499);
  13. > insert into t1 values(11,-20.500);
  14. > insert into t1 values(12,-13.500);
  15. > select a,floor(b) from t1;
  16. +------+----------+
  17. | a    | floor(b) |
  18. +------+----------+
  19. |    1 |   0.0000 |
  20. |    2 |   0.0000 |
  21. |    3 |   0.0000 |
  22. |    4 |  20.0000 |
  23. |    5 |  20.0000 |
  24. |    6 |  13.0000 |
  25. |    7 |  -1.0000 |
  26. |    8 |  -1.0000 |
  27. |    9 |  -1.0000 |
  28. |   10 | -21.0000 |
  29. |   11 | -21.0000 |
  30. |   12 | -14.0000 |
  31. +------+----------+
  32. > select sum(floor(b)) from t1;
  33. +---------------+
  34. | sum(floor(b)) |
  35. +---------------+
  36. |       -6.0000 |
  37. +---------------+
  38. > select a,sum(floor(b)) from t1 group by a order by a;
  39. +------+---------------+
  40. | a    | sum(floor(b)) |
  41. +------+---------------+
  42. |    1 |        0.0000 |
  43. |    2 |        0.0000 |
  44. |    3 |        0.0000 |
  45. |    4 |       20.0000 |
  46. |    5 |       20.0000 |
  47. |    6 |       13.0000 |
  48. |    7 |       -1.0000 |
  49. |    8 |       -1.0000 |
  50. |    9 |       -1.0000 |
  51. |   10 |      -21.0000 |
  52. |   11 |      -21.0000 |
  53. |   12 |      -14.0000 |
  54. +------+---------------+

限制

MatrixOne目前只支持在查询表的时候使用函数，不支持单独使用函数。