mysql向表中某字段后追加一段字符串:
May 31, 2016 am 08:48 AMmysql向表中某字段后追加一段字符串:update table_name set field=CONCAT(field,'',str)
mysql 向表中某字段前加字符串update table_name set field=CONCAT('str',field)
MySQL中concat函数
使用方法:
CONCAT(str1,str2,…)
返回结果为连接参数产生的字符串。如有任何一个参数为NULL ,则返回值为 NULL。
注意:
如果所有参数均为非二进制字符串,则结果为非二进制字符串。
如果自变量中含有任一二进制字符串,则结果为一个二进制字符串。
一个数字参数被转化为与之相等的二进制字符串格式;若要避免这种情况,可使用显式类型 cast, 例如:
SELECT CONCAT(CAST(int_col AS CHAR), char_col)

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