prqlc 0.13.11

PRQL is a modern language for transforming data — a simple, powerful, pipelined SQL replacement.
Documentation 
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from invoices
select { customer_id, invoice_id, billing_country }
take 5
append (
  from employees
  select { employee_id, employee_id, country }
  take 5
)
append (
  from invoice_items
  select { invoice_line_id, invoice_id, null }
  take 5
)
select { billing_country, invoice_id }