I did join on three tables.
arel = OfferOrder.includes(:a, :b, :c) arel = arel.select('(CASE WHEN
ISNULL(c.field2) THEN c.field1 ELSE c.field2 END) AS fraud')
but when I run my code it gives error that
(Mysql2::Error: You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 'AS
fraud)
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