5
drop table if exists t1;
8
create table t1 (c nchar(10));
12
create table t1 (c national char(10));
16
create table t1 (c national varchar(10));
20
create table t1 (c nvarchar(10));
24
create table t1 (c nchar varchar(10));
28
create table t1 (c national character varying(10));
32
create table t1 (c nchar varying(10));