"Toru SHIMOGAKI" <shimogaki.toru@oss.ntt.co.jp> writes:
> When a character string or a multibyte character is inserted to "char"
> column, no error occurs. Is this a bug?
That's the historical behavior of the datatype, and given that it's
been like that since Berkeley days, changing it seems ill-advised.
If you want a column that behaves sanely for multibyte data, use
char(1).
regards, tom lane