create or replace function ssndate(p_date in varchar2 default '03-01-18',
p_time in varchar2)
return number
$if dbms_db_version.ver_le_10 $then
deterministic
$elsif dbms_db_version.ver_le_11 $then
result_cache
$end
as
begin
return trunc((to_date(p_date||' '||p_time, 'dd-mm-yy hh24:mi:ss')
- to_date('01-01-90','dd-mm-yy')) * (86400/2400));
end ssndate;
/

create or replace view WEBLOG_VIEWS
as
select (select ssndate(LOG_DATE, LOG_TIME) from dual) as "SESSION_DT",
C_IP,
CS_USER_AGENT,
(CS_URI_STEM||'?'||CS_URI_QUERY) as WEB_LINK
from WEBLOG;

create table FINAL_WEBLOG as
select SESSION_DT, C_IP, CS_USER_AGENT,
listagg(WEB_LINK, ' ')
within group(order by C_IP, CS_USER_AGENT) "WEB_LINKS"
from WEBLOG_VIEWS
group by C_IP, CS_USER_AGENT, SESSION_DT
order by SESSION_DT

Error starting at line 1 in command:
create table FINAL_LOG as
select SESSION_DT, C_IP, CS_USER_AGENT,
listagg(WEB_LINK, ' ')
within group(order by C_IP, CS_USER_AGENT) "WEB_LINKS"
from WEBLOG_VIEWS
group by C_IP, CS_USER_AGENT, SESSION_DT
order by SESSION_DT
Error at Command Line:1 Column:7
Error report:
SQL Error: ORA-01861: literal does not match format string
ORA-06512: at "DMUSER.SSNDATE", line 11
ORA-06512: at line 1
01861. 00000 - "literal does not match format string"
*Cause: Literals in the input must be the same length as literals in
the format string (with the exception of leading whitespace).
If the "FX" modifier has been toggled on, the literal must
match exactly, with no extra whitespace.
*Action: Correct the format string to match the literal.