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MySQL UPSERT not recognizing alias
Posted by: Vips Ch
Date: March 24, 2015 05:29AM

have a query that performs an UPSERT (Insert - but if exists, update).

MySQL complains it isn't valid, here is the query:

insert into
mytable (user_id, num_products_observed, num_purchased_percent)
(select
A.user_id,
B.total 'num_products_observed',
case
when A.purchased is null then 0
else A.purchased/B.total
end 'num_purchased_percent'
from
(select user_id, count(prod_observed) 'total' from products where user_id = ? ) B
left join (select user_id, count(prod_purch) 'purchased' from products_purchased) A on B.user_id = A.user_id
) newsum -- <--- ISSUE IS HERE
ON DUPLICATE KEY UPDATE
num_products_observed = newsum.num_products_observed,
num_purchased_percent = newsum.num_purchased_percent



I hope this makes sense to you. The issue is at the line which reads ) newsum. MySql complains about the alias I'm giving the table. user_id is unique in this table (mytable).

It IS possible that B.total is null, in which case everything in newsum is null - which is fine, then I don't want to insert or update anything (or an update with user_id and zeros for all would be fine too).

Any thoughts on what I'm doing wrong? Thanks in advance

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March 24, 2015 05:29AM


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