method
columns_for_distinct
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Class: ActiveRecord::ConnectionAdapters::SchemaStatements
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columns_for_distinct(columns, orders)
public
Given a set of columns and an ORDER BY clause, returns the columns for a SELECT DISTINCT. PostgreSQL, MySQL, and Oracle overrides this for custom DISTINCT syntax - they require the order columns appear in the SELECT.
columns_for_distinct("posts.id", ["posts.created_at desc"])