删除记录中除最后7个字符外的所有内容

Question

I have table that contains a full mailing address for customers. I'd like to get rid of the whole address and only keep the postal code (last 7 characters, including the space). I've searched for about and hour and can't figure it out.

Table Name: Customers Column: MailingAddress

So where I'd have

    MailingAddress: 1234 Example Street, Cityplace T1U 2V4

I'd just like to have remaining

    MailingAddress: T1U 2V4

Answer 1

使用SUBSTR()

UPDATE Customers SET MailingAddress = SUBSTR(MailingAddress, -7, 7)

Answer 2

Or instead of SUBSTR() , use the slightly simpler RIGHT() to retrieve the n right-most characters of the expression.

UPDATE Customers SET MailingAddress = RIGHT(MailingAddress, 7)

...because I can personally never remember the order of arguments to SUBSTR() or when negative values are legal.

Answer 3

只需查看文档即可：

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_substr