sql截取字段最后以特定字符隔开的内容语句
文章介绍了一个Mysql批量截取最后隔开的部分到另一字段的SQL语句 有需要的朋友可以参考一下。
字段images保存的数据是: a.jpg;b.jpg;c.jpg
要把images的最后一张图片c.jpg赋值到images_default
执行的SQL语句是
代码如下 | 复制代码 |
UPDATE product SET `image_default` = REVERSE(MID(REVERSE(`images`),1,LOCATE(';',REVERSE(images))-1)) WHERE product_id > 1 |
下面我们利用了几个函数,参考
REVERSE
REVERSE(str)
返回颠倒字符顺序的字符串str。
代码如下 | 复制代码 |
> REVERSE('abc'); -> 'cba' |
该函数对多字节可靠的。
MID
MID() 函数
MID 函数用于从文本字段中提取字符。
SQL MID() 语法
代码如下 | 复制代码 |
SELECT MID(column_name,start[,length]) FROM table_name |
LOCATE
LOCATE(substr,str) , LOCATE(substr,str,pos)
第一个语法返回字符串 str中子字符串substr的第一个出现位置。第二个语法返回字符串 str中子字符串substr的第一个出现位置, 起始位置在pos。如若substr 不在str中,则返回值为0

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