SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList (children 1)
      Identifier t.database
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias t) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.tables
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier name
            Literal \'one\'
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier system.databases (alias db)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t.database
        Identifier db.name