does table names have a format and size - Mailing list pgsql-sql

Hi,

Is the name of the table important in psql... because the following
create table command doesn't create any table in the database but the
next sql command with a different table name creates the table.

Is there any table name convention in postgres.

create table IL18R---_PGA_SNPs666 (contig char(10),contig_pos
char(10),read_pos char(10),chromat char(30),sample char(30),allele1
char(20),allele2 char(20),ref_pos char(10),ref_sample char(10),tag
char(100),source char(10));

following command works well...

create table MD1_PGA_SNPs666 (contig char(10),contig_pos
char(10),read_pos char(10),chromat char(30),sample char(30),allele1
char(20),allele2 char(20),ref_pos char(10),ref_sample char(10),tag
char(100),source char(10));

thanks
Prakash