SUBSTRING(s,n,len)

SUBSTRING(s,n,len) 用于获取指定位置的子字符串

mysql> SELECT SUBSTRING(‘breakfast‘,5) AS col1,  # 从第5个字符串开始获取
    -> SUBSTRING(‘breakfast‘,5,3) AS col2,       # 从第5个字符串开始，获取3个
    -> SUBSTRING(‘breakfast‘,-5) AS col3,        # (倒向)从第5个字符串开始获取
    -> SUBSTRING(‘breakfast‘,-5,3) AS col4;      # (倒向)从第5个字符串开始获取，获取3个
+-------+------+-------+------+
| col1  | col2 | col3  | col4 |
+-------+------+-------+------+
| kfast | kfa  | kfast | kfa  |
+-------+------+-------+------+

时间： 2024-10-29 03:51:27

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