• Condition Syntax
• select, order, and group
• distinct
• pluck
• first and last (and order)
• exists?
• default_scope
• Associations
• Preloading
• Relation vs. Array
• Querying the slave
• none
• Subqueries
• merge
• Raw SQL
• Canvas Extensions
• Joins on Update and Delete
• Offset and Limit on Update and Delete
• bulk_insert