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MySQL-like group by statement on queries. It keeps only the first row of each set of rows where the given expressions evaluate to equal. [PostgreSQL Docs](https://www.postgresql.org/docs/9.5/static/sql-select.html#SQL-DISTINCT)
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MySQL-like group by statements on queries. It keeps only the first row of each set of rows where the given expressions evaluate to equal. [PostgreSQL Docs](https://www.postgresql.org/docs/9.6/static/sql-select.html#SQL-DISTINCT)
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## How it works
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```ruby
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