Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
In a MySQL database column that has been set to AUTO_INCREMENT, can I assume that the values will always be created sequentially?
For instance, if 10 rows are inserted and receive values 1,2,3,…10, and then 3 is deleted, can I assume the next row inserted will receive 11?
The reason I ask is that I’d like to sort values based on the order in which they were inserted into the table, and if I can sort based on the auto incremented primary key it will be a little easier.
From what I understand from the manual; yes. Each table has it’s own ‘next auto increment value’ that is incremented by the amount defined in auto_increment_increment (http://dev.mysql.com/doc/refman/5.0/en/replication-options-master.html#sysvar_auto_increment_increment) and that is never automatically reset, even though it can be manually reset. But as @miku said, if possible a timestamp would be preferable.