Question

I’m doing a select inside a mysql event, and then trying to update another table with data from that select. But it does not seem to be working.

I’m doing:

BEGIN
select read_pub_id, read_artc_id, count(read_artc_id) as times_read from reads_t GROUP BY read_pub_id, read_artc_id;
update reads_totals set read_total = times_read where pub_id = read_pub_id and artc_id = read_artc_id;
update reads_totals set ts=now(); /*This is for testing*/
END

Only the ts gets updated. Which means the event is working.

Is there a while loop to be added in here, and how? Whats the right way to do this?

My previous question relating to this is here:

https://stackoverflow.com/questions/13110393/doing-a-count-along-with-distinct-to-check-number-of-times-a-post-was-read

Answer 1

 select read_pub_id, read_artc_id, count(read_artc_id) as times_read from reads_t 
 GROUP BY read_pub_id, read_artc_id;
 update reads_totals
 set read_total = (select count(read_artc_id) from reads_t rt 
 where pub_id = rt.read_pub_id 
 and artc_id = rt.read_artc_id);