SQL> set names win1251;
SQL> create database 'z:\temp\v.fdb';

SQL> show version;
ISQL Version: WI-V3.0.8.33484 Firebird 3.0
Server version:
Firebird/Windows/AMD/Intel/x64 (access method), version "WI-V3.0.8.33484 Firebird 3.0"
on disk structure version 12.0

SQL> CREATE TABLE TB1 (
CON> RENT_MIN SMALLINT,
CON> RENT_MAX SMALLINT
CON> );

SQL> CREATE VIEW VW_TB1(
CON> RENT)
CON> AS
CON> select
CON> 'от '||rent_min||' до '||rent_max||' дней'
CON> from tb1
CON> ;

SQL> INSERT INTO TB1 (RENT_MIN, RENT_MAX)
CON> VALUES (1, 1);
SQL>
SQL>
SQL> COMMIT WORK;

SQL> show view VW_TB1;
RENT                            VARCHAR(24) CHARACTER SET WIN1251 Expression
View Source:
==== ======
select
'от '||rent_min||' до '||rent_max||' дней'
from tb1

SQL> CREATE OR ALTER VIEW VW_TB1 (
CON> RENT)
CON> AS
CON> select
CON> 'аренда от '||rent_min||' до '||rent_max||' дней'
CON> from tb1;
SQL>
SQL> show view VW_TB1;
RENT                            VARCHAR(31) CHARACTER SET WIN1251 Expression
View Source:
==== ======
select
'аренда от '||rent_min||' до '||rent_max||' дней'
from tb1
SQL>
SQL> drop database;