Note that avpops is deprecated in upcoming SER 2.0  (still present, butnot maintained). Selects, avps and a couple of more powerful modulestake over. See docs: http://www.iptel.org/ser/doc/modules/avpops You need an attribute column defined (in your dbscheme), which shouldbe identified in the second param to avp_db_delete. g-) chungyu wrote: Dear all:  avpops module' exported function avp_db_delete() can do delete onerecord?   example:            I use "test" as default table that has two fields.   username |  number ------------------- bob      |  1 alice    |  1 bob      |  2   my configuration: modparam("avpops", "avp_url", "mysql://ser:heslo@localhost/ser") modparam("avpops", "avp_table", "test") modparam("avpops", "username_column", "username") modparam("avpops", "avp_aliases", "num=i:55") modparam("avpops", "db_scheme","number_scheme:table=test;value_col=number;value_type=string")   if (method=="INVITE"){    avp_db_load("$from/username", "$num/$number_scheme");   //load fromtable "test" ,number column as string value into AVP name '$num'    avp_db_delete("$from/username", "s:test")     //delete all bob'record };   if bob calling then bob'record has deleted   username  |  number -------------------- alice     |  1   But i want delete a record. ex: delete number value is 1 for bob   username  |  number -------------------- alice     |   1 --------------------- bob       |   2   avp_db_delete() can do delete one record?   Another question is avp_db_store() can do insertnew data in table?   ex:  insert into test (username,number) values("mary","3")   username  |  number ------------------- alice     |    1 ------------------- bob       |    2 ------------------- mary      |    3   avp_db_store() can do it?   sorry,I still can't understand what it mean aboutavp_db_store() and avp_db_delete(). Can tell me? Thanks a lot in advance   Chungyu