SUBSTRING(s,n,len)
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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 | +-------+------+-------+------+
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