text: --import interval.sql
  
  -- the `interval` keyword can be omitted with ansi mode
  select 1 year 2 days;
  select '10-9' year to month;
  select '20 15:40:32.99899999' day to second;
  select 30 day day;
  select date'2012-01-01' - '2-2' year to month;
  select 1 month - 1 day;
  
  -- malformed interval literal with ansi mode
  select 1 year to month;
  select '1' year to second;
  select 1 year '2-1' year to month;
  select (-30) day;
  select (a + 1) day;
  select 30 day day day;