MySQL SELECT REPLACE字符串的一部分

Question

I have a column with data like this:

http://www.example.com/category/link.html
http://www.example2.com/category2/link.html
http://www.example3.com/directory/category/link.php
http://www.example4.com/category4/link.php
http://www.example5.com/directory/link.html

I want to select the distinct domain.com part of these links, and then insert this into another column

SELECT DISTINCT REPLACE(domain,'http://www.','') AS domain FROM table;

This selects everything without the http://www. How do I remove the rest of the link so im left with domain.com and then insert this into another column?

Answer 1

You can do this with substring_index() . For instance, this might work on your data:

select substring_index(substring_index(col, '/', 3), '.', -2) as domain

Answer 2

Try this:

SELECT DISTINCT SUBSTRING_INDEX(REPLACE(domain,'http://www.',''), '/', 1) AS domain
FROM mytable

Applying SUBSTRING_INDEX after 'http://www.' has been eliminated from the domain string, returns the part of the string before the first occurrence of '/' .

Demo here