sql - Check future date in trigger -


i want launch trigger if user try replace current date future date.but subquery might not allowed in trigger. how can solve issue? suggestion....

  create or replace trigger check_join_date         before update of join_date on doctor         each row         when (new.join_date > (select current_date+1 dual) )     begin         raise_application_error(-20509,'do not enter future date..');     end check_join_date;     /

i getting error after running code in oracle.

ora-02251: subquery not allowed here

test this

create or replace trigger check_join_date         before update of join_date on doctor         each row         when (new.join_date > current_date+1)     begin         raise_application_error(-20509,'do not enter future date..');     end check_join_date;     /

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