MySQL how to do an if exist increment in a single query

Question

I just wish to have a table to store a number of events by day.

Given a table:

create table totals (
    entryday date,
    total int(11) default 0 n         


        

Answer 1

For MySQL 5.0+, see INSERT ON DUPLICATE KEY UPDATE.

INSERT INTO totals (entryday, total) VALUES ("08-01-11", 1)
  ON DUPLICATE KEY UPDATE total=total+1;