split_part

description

Syntax

VARCHAR split_part(VARCHAR content, VARCHAR delimiter, INT field)

根据分割符拆分字符串, 返回指定的分割部分(从一或负一开始计数)。field字段支持负数，代表从右往左倒着截取并取数。 delimiter 和 field 参数需要是常量, 不支持变量。

example

  1. mysql> select split_part("hello world", " ", 1);
  2. +----------------------------------+
  3. | split_part('hello world', ' ', 1) |
  4. +----------------------------------+
  5. | hello                            |
  6. +----------------------------------+
  9. mysql> select split_part("hello world", " ", 2);
  10. +----------------------------------+
  11. | split_part('hello world', ' ', 2) |
  12. +----------------------------------+
  13. | world                             |
  14. +----------------------------------+
  16. mysql> select split_part("2019年7月8号", "月", 1);
  17. +-----------------------------------------+
  18. | split_part('2019年7月8号', '月', 1)     |
  19. +-----------------------------------------+
  20. | 2019年7                                 |
  21. +-----------------------------------------+
  23. mysql> select split_part("abca", "a", 1);
  24. +----------------------------+
  25. | split_part('abca', 'a', 1) |
  26. +----------------------------+
  27. |                            |
  28. +----------------------------+
  30. mysql> select split_part("prefix_string", "_", -1);
  31. +--------------------------------------+
  32. | split_part('prefix_string', '_', -1) |
  33. +--------------------------------------+
  34. | string                               |
  35. +--------------------------------------+
  37. mysql> select split_part("prefix_string", "_", -2);
  38. +--------------------------------------+
  39. | split_part('prefix_string', '_', -2) |
  40. +--------------------------------------+
  41. | prefix                               |
  42. +--------------------------------------+
  44. mysql> select split_part("abc##123###234", "##", -1);
  45. +----------------------------------------+
  46. | split_part('abc##123###234', '##', -1) |
  47. +----------------------------------------+
  48. | 234                                    |
  49. +----------------------------------------+
  51. mysql> select split_part("abc##123###234", "##", -2);
  52. +----------------------------------------+
  53. | split_part('abc##123###234', '##', -2) |
  54. +----------------------------------------+
  55. | 123#                                   |
  56. +----------------------------------------+

keywords

  1. SPLIT_PART,SPLIT,PART