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substring_index
substring_index
description
Syntax
VARCHAR substring_index(VARCHAR content, VARCHAR delimiter, INT field)
返回 content 的子字符串,在 delimiter 出现 field 次的位置按如下规则截取:
如果 field > 0,则从左边算起,返回截取位置前的子串;
如果 field < 0,则从右边算起,返回截取位置后的子串; 如果 field = 0,返回一个空串(content 不为null), 或者Null (content = null)。
example
mysql> select substring_index("hello world", " ", 1);
+----------------------------------------+
| substring_index("hello world", " ", 1) |
+----------------------------------------+
| hello |
+----------------------------------------+
mysql> select substring_index("hello world", " ", 2);
+----------------------------------------+
| substring_index("hello world", " ", 2) |
+----------------------------------------+
| hello world |
+----------------------------------------+
mysql> select substring_index("hello world", " ", -1);
+-----------------------------------------+
| substring_index("hello world", " ", -1) |
+-----------------------------------------+
| world |
+-----------------------------------------+
mysql> select substring_index("hello world", " ", -2);
+-----------------------------------------+
| substring_index("hello world", " ", -2) |
+-----------------------------------------+
| hello world |
+-----------------------------------------+
mysql> select substring_index("hello world", " ", -3);
+-----------------------------------------+
| substring_index("hello world", " ", -3) |
+-----------------------------------------+
| hello world |
+-----------------------------------------+
mysql> select substring_index("hello world", " ", 0);
+----------------------------------------+
| substring_index("hello world", " ", 0) |
+----------------------------------------+
| |
+----------------------------------------+
作者:超级管理员 创建时间:2023-06-15 09:58
最后编辑:超级管理员 更新时间:2024-09-05 21:06
最后编辑:超级管理员 更新时间:2024-09-05 21:06