select MIN(SUBSTRING(wr_reply, 1, 1)) as reply from where wr_num = '' and SUBSTRING(wr_reply, 1, 1) <> ''

1064 : You have an error in your SQL syntax near 'where wr_num = '' and SUBSTRING(wr_reply, 1, 1) <> '' ' at line 1

error file : /gnuboard4/bbs/write.php