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公众号该公众号已被封禁抓紧get新技能吧~MySQL常用字符串函数大写转小写 lower()mysql> select lower("KFDSKGS");+------------------+| lower("KFDSKGS") |+------------------+| kfdskgs |+------------------+小写转大写 upper()mysql> select upper("fdssssssss");+-------------------+| upper("fdssssssss") |+-------------------+| FDSSSSSSSS |+-------------------+字符串的连接 concat()mysql> select concat("My","S","QL");+--------------------+| concat("My","S","QL") |+--------------------+| MySQL |+--------------------+截取字符串 substr() / substring()mysql> select substring("Hello world",5);+-----------------------+| substring("Hello world",5) |+-----------------------
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