SQL & PL/SQL

hi all,

does we have sysuser as sysdate.

i am able to run the query:
create table date1 (data date);
insert into date1 values(sysdate);

in the same way i want to insert system user
create table user1(data varcahr2(30));
insert into user1 values(sysuser);

this insert statement is giving "column not allowed here" error. please let me know how to insert the system user into the table.

if i use 'shoe user' in sqlplus it showing the user.