Mysql: Find rows, where timestamp difference is less than x

Question

I\'ve got table structure as follows:

Field       Type
id              int(11)      AI
user            varchar(64)
date            timestamp
key             int         


        

Answer 1

This seems to be one of those rare cases where using a CURSOR is truly the most appropriate, and performant option.

However, if performance is not a consideration, you could do a correlated subquery, like the following

SELECT *, second_time - first_time
   FROM
   (
      SELECT T.user, 
             T.date      AS first_time, 
             (SELECT MIN(S.date) 
                FROM My_Table S 
                WHERE S.user = T.user
                  AND S.date > T.date
             )                         AS second_time
        FROM My_Table T
   ) G
   WHERE (second_time - first_time) < 1300

This will run very slowly on large data sets.