Write 'AAA' but get 'A'

[Anonymous]

My table have a NVARCHAR fields
I used code, below

with ClientDataSet1 do
begin
  Append;
  FieldByName('FieldTest').AsString := 'AAA';
  Pose;
  ApplyUpdate(0);
end;

But!
I used SQL: select FieldTest from TEST
I get 'A', only 1 char…

Why???
Delphi 2009/XE
Windows 2000/XP
SQL Server 2000

[Anonymous]

Ohh…
Because my field type is "VARCHAR".
Modify "VARCHAR" to "NVARCHAR" is OK.