Question

I want to GROUP and aggregate the rows from one table and insert into the other, and update the aggregate value. What is the SQL command for that?

INSERT INTO tbdetail (detail, views)
(SELECT detail, SUM(views) AS viewsall
 FROM tb
 GROUP BY detail)
//ON DUPLICATE KEY UPDATE views = views + viewsall <- how to update here?

Answer 1

In MySQL, when using an INSERT ... SELECT statement, you can refer to one of the values of the SELECT statement using the VALUES() function:

INSERT INTO tbdetail (detail, views)

SELECT detail, SUM(views) AS viewsall FROM tb GROUP BY detail

ON DUPLICATE KEY UPDATE views = views + VALUES(views);

More information here: http://dev.mysql.com/doc/refman/5.0/en/miscellaneous-functions.html#function_values