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