如何在mysql中创建多个substring_index

Question

Howto perform this in mysql

(substring_index(domain,'.',-3) OR (substring_index(domain,'.',-2)) IN (".implode(",", $domains)."))

When i run it with only

substring_index(domain,'.',-2) IN (".implode(",", $domains)."))

it works and

substring_index(domain,'.',-3) IN (".implode(",", $domains)."))

But the OR function makes the query return none

Solution found. My problem was that my max_allowed_packet size was to small, and i got many entyes 40k at the IN statement.

Answer 1

You have to add 2 statements

substring_index(domain,'.',-2) IN (".implode(",", $domains).") 
OR 
substring_index(domain,'.',-3) IN (".implode(",", $domains).")