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我觉得应该是版本低的问题。
有何根据?修改为
substr(name,-100,8)都不应该报错.The position at which the first character of the returned string begins.When position is 0 (zero), then it is treated as 1.When position is positive, then the function counts from the beginning of string to find the first character.When position is negative, then the function counts backward from the end of string.
有何根据?修改为
substr(name,-100,8)都不应该报错.The position at which the first character of the returned string begins.When position is 0 (zero), then it is treated as 1.When position is positive, then the function counts from the beginning of string to find the first character.When position is negative, then the function counts backward from the end of string.
那就抱歉了,我不知道是怎么回事了