Ruby on Rails

> by doing some research on Google, I found out that it's a DB Engin
> problem. MySql allows me to do it but PostgreSql does not.
>
> How can I run the same query on PostgreSql.

I've run into such problem when I changed from MySQL to PostgreSQL some
time ago. basically MySQL is to databases what php is to programming
languages, i.e: it's permissive.

I guess your query is not fully SQL compliant, but MySQL let's you get
away with it whereas PostgreSQL complains and wants a legit query.
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