anchor.diff:  (['silo 1'],)
   
   ----
  +
  +
  +=== Many SQL Statements Can't Be Parameterized
  +
  +In PostgreSQL parameters can only be used for
  +https://www.postgresql.org/docs/current/xfunc-sql.html#XFUNC-SQL-FUNCTION-ARGUMENTS[data values, not identifiers]. Sometimes this might not work as expected,
  +for example the following fails:
  +
  +[source,python]
  +----
  +>>> con.run("CREATE USER juan WITH PASSWORD :password", password='quail')
  +Traceback (most recent call last):
  +pg8000.core.ProgrammingError: ...
  +>>> con.rollback()
  +
  +----
  +
  +It fails because the PostgreSQL server doesn't allow this statement to have
  +any parameters. There are many SQL statements that one might think
  +would have parameters, but don't.
   
   
   === COPY from and to a file
  
positive.code: ----
  
  
  === Parameters Are For Data Not Identifiers
  
  In PostgreSQL parameters can only be used for
  https://www.postgresql.org/docs/current/xfunc-sql.html#XFUNC-SQL-FUNCTION-ARGUMENTS[data values, not identifiers]. Sometimes this might not work as expected,
  for example the following fails:
  
  [source,python]
  ----
  
negative.code: >>> conn.commit()
  >>> conn.notifications[0][1]
  'aliens_landed'
  
  ----
  
  